This list is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece.
If you find something which doesn't make sense, or something doesn't seem right, please make a pull request and please add valid and well-reasoned explanations about your changes or comments.
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:small_orange_diamond: <ahref="https://www.gnu.org/software/bash/"><b>GNU Bash</b></a> - is an sh-compatible shell that incorporates useful features from the Korn shell and C shell.<br>
:small_orange_diamond: <ahref="https://www.zsh.org/"><b>Zsh</b></a> - is a shell designed for interactive use, although it is also a powerful scripting language.<br>
:small_orange_diamond: <ahref="https://github.com/Bash-it/bash-it"><b>bash-it</b></a> - is a framework for using, developing and maintaining shell scripts and custom commands.<br>
:small_orange_diamond: <ahref="https://midnight-commander.org/"><b>Midnight Commander</b></a> - is a visual file manager, licensed under GNU General Public License.<br>
:small_orange_diamond: <ahref="https://github.com/ranger/ranger"><b>ranger</b></a> - is a VIM-inspired filemanager for the console.<br>
:small_orange_diamond: <ahref="https://github.com/jarun/nnn"><b>nnn</b></a> - is a tiny, lightning fast, feature-packed file manager.<br>
:small_orange_diamond: <ahref="https://www.gnu.org/software/screen/"><b>screen</b></a> - is a full-screen window manager that multiplexes a physical terminal.<br>
:small_orange_diamond: <ahref="https://github.com/tmux/tmux/wiki"><b>tmux</b></a> - is a terminal multiplexer, lets you switch easily between several programs in one terminal.<br>
:small_orange_diamond: <ahref="https://github.com/peikk0/tmux-cssh"><b>tmux-cssh</b></a> - is a tool to set comfortable and easy to use functionality, clustering and synchronizing tmux-sessions.<br>
:small_orange_diamond: <ahref="https://www.gnu.org/software/emacs/"><b>emacs</b></a> - is an extensible, customizable, free/libre text editor - and more.<br>
:small_orange_diamond: <ahref="https://www.putty.org/"><b>PuTTY</b></a> - is an SSH and telnet client, developed originally by Simon Tatham.<br>
:small_orange_diamond: <ahref="https://nmap.org/"><b>nmap</b></a> - is a free and open source (license) utility for network discovery and security auditing.<br>
:small_orange_diamond: <ahref="https://github.com/robertdavidgraham/masscan"><b>masscan</b></a> - is the fastest Internet port scanner, spews SYN packets asynchronously.<br>
:small_orange_diamond: <ahref="https://github.com/gvb84/pbscan"><b>pbscan</b></a> - is a faster and more efficient stateless SYN scanner and banner grabber.<br>
:small_orange_diamond: <ahref="http://www.hping.org/"><b>hping</b></a> - is a command-line oriented TCP/IP packet assembler/analyzer.<br>
:small_orange_diamond: <ahref="https://github.com/traviscross/mtr"><b>mtr</b></a> - is a tool that combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.<br>
:small_orange_diamond: <ahref="http://netcat.sourceforge.net/"><b>netcat</b></a> - is a networking utility which reads and writes data across network connections, using the TCP/IP protocol.<br>
:small_orange_diamond: <ahref="https://www.tcpdump.org/"><b>tcpdump</b></a> - is a powerful command-line packet analyzer.<br>
:small_orange_diamond: <ahref="https://www.wireshark.org/docs/man-pages/tshark.html"><b>tshark</b></a> - is a tool that allows us to dump and analyze network traffic (wireshark cli).<br>
:small_orange_diamond: <ahref="https://github.com/google/stenographer"><b>stenographer</b></a> - is a packet capture solution which aims to quickly spool all packets to disk.<br>
:small_orange_diamond: <ahref="https://github.com/tgraf/bmon"><b>bmon</b></a> - is a monitoring and debugging tool to capture networking related statistics and prepare them visually.<br>
:small_orange_diamond: <ahref="http://iptraf.seul.org/2.6/manual.html#installation"><b>iptraf-ng</b></a> - is a console-based network monitoring program for Linux that displays information about IP traffic.<br>
:small_orange_diamond: <ahref="https://iperf.fr/"><b>iPerf3</b></a> - is a tool for active measurements of the maximum achievable bandwidth on IP networks.<br>
:small_orange_diamond: <ahref="https://github.com/Microsoft/Ethr"><b>ethr</b></a> - is a Network Performance Measurement Tool for TCP, UDP & HTTP.<br>
:small_orange_diamond: <ahref="https://github.com/jwbensley/Etherate"><b>Etherate</b></a> - is a Linux CLI based Ethernet and MPLS traffic testing tool.<br>
:small_orange_diamond: <ahref="https://github.com/troglobit/nemesis"><b>Nemesis</b></a> - packet manipulation CLI tool; craft and inject packets of several protocols.<br>
:small_orange_diamond: <ahref="https://github.com/packetfu/packetfu"><b>packetfu</b></a> - a mid-level packet manipulation library for Ruby.<br>
:small_orange_diamond: <ahref="https://scapy.net/"><b>Scapy</b></a> - packet manipulation library; forge, send, decode, capture packets of a wide number of protocols.<br>
:small_orange_diamond: <ahref="https://github.com/SecureAuthCorp/impacket"><b>impacket</b></a> - is a collection of Python classes for working with network protocols.<br>
:small_orange_diamond: <ahref="https://github.com/mschwager/fierce"><b>fierce</b></a> - is a DNS reconnaissance tool for locating non-contiguous IP space.<br>
:small_orange_diamond: <ahref="https://github.com/subfinder/subfinder"><b>subfinder</b></a> - is a subdomain discovery tool that discovers valid subdomains for websites.<br>
:small_orange_diamond: <ahref="https://github.com/aboul3la/Sublist3r"><b>sublist3r</b></a> - is a fast subdomains enumeration tool for penetration testers.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/Amass"><b>amass</b></a> - is tool that obtains subdomain names by scraping data sources, crawling web archives and more.<br>
:small_orange_diamond: <ahref="https://github.com/google/namebench"><b>namebench</b></a> - provides personalized DNS server recommendations based on your browsing history.<br>
:small_orange_diamond: <ahref="https://github.com/jedisct1/dnscrypt-proxy"><b>dnscrypt-proxy 2</b></a> - a flexible DNS proxy, with support for encrypted DNS protocols.<br>
:small_orange_diamond: <ahref="https://curl.haxx.se/"><b>Curl</b></a> - is a command line tool and library for transferring data with URLs.<br>
:small_orange_diamond: <ahref="https://gitlab.com/davidjpeacock/kurly"><b>kurly</b></a> - is an alternative to the widely popular curl program, written in Golang.<br>
:small_orange_diamond: <ahref="https://github.com/asciimoo/wuzz"><b>wuzz</b></a> - is an interactive cli tool for HTTP inspection.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/htrace.sh"><b>htrace.sh</b></a> - is a simple Swiss Army knife for http/https troubleshooting and profiling.<br>
:small_orange_diamond: <ahref="https://github.com/reorx/httpstat"><b>httpstat</b></a> - is a tool that visualizes curl statistics in a way of beauty and clarity.<br>
:small_orange_diamond: <ahref="https://github.com/gchaincl/httplab"><b>httplab</b></a> - is an interactive web server.<br>
:small_orange_diamond: <ahref="https://github.com/dhamaniasad/HeadlessBrowsers"><b>HeadlessBrowsers</b></a> - a list of (almost) all headless web browsers in existence.<br>
:small_orange_diamond: <ahref="https://httpd.apache.org/docs/2.4/programs/ab.html"><b>ab</b></a> - is a single-threaded command line tool for measuring the performance of HTTP web servers.<br>
:small_orange_diamond: <ahref="https://www.joedog.org/siege-home/"><b>siege</b></a> - is an http load testing and benchmarking utility.<br>
:small_orange_diamond: <ahref="https://github.com/wg/wrk"><b>wrk</b></a> - is a modern HTTP benchmarking tool capable of generating significant load.<br>
:small_orange_diamond: <ahref="https://github.com/codesenberg/bombardier"><b>bombardier</b></a> - is a fast cross-platform HTTP benchmarking tool written in Go.<br>
:small_orange_diamond: <ahref="https://github.com/tarekziade/boom"><b>boom</b></a> - is a script you can use to quickly smoke-test your web app deployment.<br>
:small_orange_diamond: <ahref="https://github.com/shekyan/slowhttptest"><b>SlowHTTPTest</b></a> - is a tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP.<br>
:small_orange_diamond: <ahref="https://github.com/OJ/gobuster"><b>gobuster</b></a> - is a free and open source directory/file & DNS busting tool written in Go.<br>
:small_orange_diamond: <ahref="https://www.openssl.org/"><b>openssl</b></a> - is a robust, commercial-grade, and full-featured toolkit for the TLS and SSL protocols.<br>
:small_orange_diamond: <ahref="https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html"><b>gnutls-cli</b></a> - client program to set up a TLS connection to some other computer.<br>
:small_orange_diamond: <ahref="https://github.com/drwetter/testssl.sh"><b>testssl.sh</b></a> - testing TLS/SSL encryption anywhere on any port.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/cipherscan"><b>cipherscan</b></a> - a very simple way to find out which SSL ciphersuites are supported by a target.<br>
:small_orange_diamond: <ahref="http://www.tarsnap.com/spiped.html"><b>spiped</b></a> - is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses.<br>
:small_orange_diamond: <ahref="https://github.com/certbot/certbot"><b>Certbot</b></a> - is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server.<br>
:small_orange_diamond: <ahref="https://github.com/FiloSottile/mkcert"><b>mkcert</b></a> - simple zero-config tool to make locally trusted development certificates with any names you'd like.<br>
:small_orange_diamond: <ahref="https://github.com/yassineaboukir/sublert"><b>Sublert</b></a> - is a security and reconnaissance tool to automatically monitor new subdomains.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/mkchain"><b>mkchain</b></a> - open source tool to help you build a valid SSL certificate chain.<br>
:small_orange_diamond: <ahref="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/deployment_guide/ch-selinux"><b>SELinux</b></a> - provides a flexible Mandatory Access Control (MAC) system built into the Linux kernel.<br>
:small_orange_diamond: <ahref="https://wiki.ubuntu.com/AppArmor"><b>AppArmor</b></a> - proactively protects the operating system and applications from external or internal threats.<br>
:small_orange_diamond: <ahref="https://www.ossec.net/"><b>ossec</b></a> - actively monitoring all aspects of system activity with file integrity monitoring.<br>
:small_orange_diamond: <ahref="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security_guide/chap-system_auditing"><b>auditd</b></a> - provides a way to track security-relevant information on your system.<br>
:small_orange_diamond: <ahref="https://www.nongnu.org/tiger/"><b>Tiger</b></a> - is a security tool that can be use both as a security audit and intrusion detection system.<br>
:small_orange_diamond: <ahref="https://cisofy.com/lynis/"><b>Lynis</b></a> - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system.<br>
:small_orange_diamond: <ahref="https://github.com/installation/rkhunter"><b>Rkhunter</b></a> - scanner tool for Linux systems that scans backdoors, rootkits and local exploits on your systems.<br>
:small_orange_diamond: <ahref="https://github.com/hasherezade/pe-sieve"><b>PE-sieve</b></a> - is a light-weight tool that helps to detect malware running on the system.<br>
:small_orange_diamond: <ahref="http://dtrace.org/blogs/about/"><b>DTrace</b></a> - is a performance analysis and troubleshooting tool.<br>
:small_orange_diamond: <ahref="https://en.wikipedia.org/wiki/Ltrace"><b>ltrace</b></a> - is a library call tracer, used to trace calls made by programs to library functions.<br>
:small_orange_diamond: <ahref="https://github.com/brendangregg/perf-tools"><b>perf-tools</b></a> - performance analysis tools based on Linux perf_events (aka perf) and ftrace.<br>
:small_orange_diamond: <ahref="https://github.com/draios/sysdig"><b>sysdig</b></a> - system exploration and troubleshooting tool with first class support for containers.<br>
:small_orange_diamond: <ahref="http://www.valgrind.org/"><b>Valgrind</b></a> - is an instrumentation framework for building dynamic analysis tools.<br>
:small_orange_diamond: <ahref="https://nicolargo.github.io/glances/"><b>glances</b></a> - cross-platform system monitoring tool written in Python.<br>
:small_orange_diamond: <ahref="https://github.com/hishamhm/htop"><b>htop</b></a> - interactive text-mode process viewer for Unix systems. It aims to be a better 'top'.<br>
:small_orange_diamond: <ahref="https://en.wikipedia.org/wiki/Lsof"><b>lsof</b></a> - displays in its output information about files that are opened by processes.<br>
:small_orange_diamond: <ahref="https://github.com/zevv/lsofgraph"><b>lsofgraph</b></a> - small utility to convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/rr"><b>rr</b></a> - is a lightweight tool for recording, replaying and debugging execution of applications.<br>
:small_orange_diamond: <ahref="https://github.com/rcoh/angle-grinder"><b>angle-grinder</b></a> - slice and dice log files on the command line.<br>
:small_orange_diamond: <ahref="https://goaccess.io/"><b>GoAccess</b></a> - real-time web log analyzer and interactive viewer that runs in a terminal.<br>
:small_orange_diamond: <ahref="https://github.com/dbcli/pgcli"><b>pgcli</b></a> - postgres CLI with autocompletion and syntax highlighting.<br>
:small_orange_diamond: <ahref="https://github.com/dbcli/mycli"><b>mycli</b></a> - terminal client for MySQL with autocompletion and syntax highlighting.<br>
:small_orange_diamond: <ahref="https://github.com/GouveaHeitor/nipe"><b>Nipe</b></a> - script to make Tor Network your default gateway.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/multitor"><b>multitor</b></a> - a tool that lets you create multiple TOR instances with a load-balancing.<br>
:small_orange_diamond: <ahref="https://github.com/rgburke/grv"><b>GRV</b></a> - is a terminal based interface for viewing Git repositories.<br>
:small_orange_diamond: <ahref="https://github.com/Guake/guake"><b>Guake</b></a> - is a dropdown terminal made for the GNOME desktop environment.<br>
:small_orange_diamond: <ahref="https://gnometerminator.blogspot.com/p/introduction.html"><b>Terminator</b></a> - is based on GNOME Terminal, useful features for sysadmins and other users.<br>
:small_orange_diamond: <ahref="https://sw.kovidgoyal.net/kitty/"><b>Kitty</b></a> - is a GPU based terminal emulator that supports smooth scrolling and images.<br>
:small_orange_diamond: <ahref="https://www.wireshark.org/"><b>Wireshark</b></a> - is the world’s foremost and widely-used network protocol analyzer.<br>
:small_orange_diamond: <ahref="https://jmeter.apache.org/"><b>JMeter™</b></a> - open source software to load test functional behavior and measure performance.<br>
:small_orange_diamond: <ahref="https://github.com/locustio/locust"><b>locust</b></a> - scalable user load testing tool written in Python.<br>
:small_orange_diamond: <ahref="https://www.torproject.org/"><b>TOR Browser</b></a> - protect your privacy and defend yourself against network surveillance and traffic analysis.<br>
:small_orange_diamond: <ahref="https://keepassxc.org/"><b>KeePassXC</b></a> - store your passwords safely and auto-type them into your everyday websites and apps.<br>
:small_orange_diamond: <ahref="https://www.signal.org/"><b>Signal</b></a> - is an encrypted communications app.<br>
:small_orange_diamond: <ahref="https://wire.com/en/"><b>Wire</b></a> - secure messaging, file sharing, voice calls and video conferences. All protected with end-to-end encryption.<br>
:small_orange_diamond: <ahref="https://github.com/prof7bit/TorChat"><b>TorChat</b></a> - decentralized anonymous instant messenger on top of Tor Hidden Services.<br>
:small_orange_diamond: <ahref="https://www.sublimetext.com/3"><b>Sublime Text</b></a> - is a lightweight, cross-platform code editor known for its speed, ease of use.<br>
:small_orange_diamond: <ahref="https://code.visualstudio.com/"><b>Visual Studio Code</b></a> - an open-source and free source code editor developed by Microsoft.<br>
:small_orange_diamond: <ahref="https://www.ssllabs.com/ssltest/viewMyClient.html"><b>SSL/TLS Capabilities of Your Browser</b></a> - test your browser's SSL implementation.<br>
:small_orange_diamond: <ahref="https://caniuse.com/"><b>Can I use</b></a> - provides up-to-date browser support tables for support of front-end web technologies.<br>
:small_orange_diamond: <ahref="https://panopticlick.eff.org/"><b>Panopticlick 3.0</b></a> - is your browser safe against tracking?<br>
:small_orange_diamond: <ahref="https://privacy.net/analyzer/"><b>Privacy Analyzer</b></a> - see what data is exposed from your browser.<br>
:small_orange_diamond: <ahref="https://www.howsmyssl.com/"><b>How's My SSL?</b></a> - help a web server developer learn what real world TLS clients were capable of.<br>
:small_orange_diamond: <ahref="https://www.ssllabs.com/ssltest/"><b>SSLLabs Server Test</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
:small_orange_diamond: <ahref="https://dev.ssllabs.com/ssltest/"><b>SSLLabs Server Test (DEV)</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
:small_orange_diamond: <ahref="https://report-uri.com/home/tools"><b>Report URI</b></a> - monitoring security policies like CSP and HPKP.<br>
:small_orange_diamond: <ahref="https://csp-evaluator.withgoogle.com/"><b>CSP Evaluator</b></a> - allows developers and security experts to check if a Content Security Policy.<br>
:small_orange_diamond: <ahref="https://uselesscsp.com/"><b>Useless CSP</b></a> - public list about CSP in some big players (might make them care a bit more).<br>
:small_orange_diamond: <ahref="https://whynohttps.com/"><b>Why No HTTPS?</b></a> - list of the world's top 100 websites by Alexa rank not automatically redirecting insecure requests.<br>
:small_orange_diamond: <ahref="https://badssl.com/"><b>badssl.com</b></a> - memorable site for testing clients against bad SSL configs.<br>
:small_orange_diamond: <ahref="https://ccadb.org/resources"><b>Common CA Database</b></a> - repository of information about CAs, and their root and intermediate certificates.<br>
:small_orange_diamond: <ahref="https://crt.sh/"><b>crt.sh</b></a> - discovers certificates by continually monitoring all of the publicly known CT.<br>
:small_orange_diamond: <ahref="https://cryptcheck.fr/suite/"><b>Cipher suite compatibility</b></a> - test TLS cipher suite compatibility.<br>
:small_orange_diamond: <ahref="https://www.urlvoid.com/"><b>urlvoid</b></a> - this service helps you detect potentially malicious websites.<br>
:small_orange_diamond: <ahref="https://securitytxt.org/"><b>security.txt</b></a> - a proposed standard (generator) which allows websites to define security policies.<br>
:small_orange_diamond: <ahref="https://securityheaders.com/"><b>Security Headers</b></a> - analyse the HTTP response headers (with rating system to the results).<br>
:small_orange_diamond: <ahref="https://observatory.mozilla.org/"><b>Observatory by Mozilla</b></a> - set of tools to analyze your website.<br>
:small_orange_diamond: <ahref="https://webhint.io/"><b>webhint</b></a> - is a linting tool that will help you with your site's accessibility, speed, security and more.<br>
:small_orange_diamond: <ahref="https://www.buddyns.com/delegation-lab/"><b>BuddyDNS Delegation LAB</b></a> - check, trace and visualize delegation of your domain.<br>
:small_orange_diamond: <ahref="https://dnssec-debugger.verisignlabs.com/"><b>dnssec-debugger</b></a> - DS or DNSKEY records validator.<br>
:small_orange_diamond: <ahref="http://ptrarchive.com/"><b>PTRarchive.com</b></a> - this site is responsible for the safekeeping of historical reverse DNS records.<br>
:small_orange_diamond: <ahref="https://ceipam.eu/en/dnslookup.php"><b>dnslookup (ceipam)</b></a> - one of the best DNS propagation checker (and not only).<br>
:small_orange_diamond: <ahref="https://mxtoolbox.com/SuperTool.aspx"><b>MX Toolbox</b></a> - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.<br>
:small_orange_diamond: <ahref="http://www.blacklistalert.org/"><b>blacklistalert</b></a> - checks to see if your domain is on a Real Time Spam Blacklist.<br>
:small_orange_diamond: <ahref="http://multirbl.valli.org/"><b>MultiRBL</b></a> - complete IP check for sending Mailservers.<br>
##### :black_small_square: Encoders/Decoders and Regex testing
<p>
:small_orange_diamond: <ahref="https://www.url-encode-decode.com/"><b>URL Encode/Decode</b></a> - tool from above to either encode or decode a string of text.<br>
:small_orange_diamond: <ahref="https://uncoder.io/"><b>Uncoder</b></a> - the online translator for search queries on log data.<br>
:small_orange_diamond: <ahref="https://regex101.com/"><b>Regex101</b></a> - online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript.<br>
:small_orange_diamond: <ahref="https://regexr.com/"><b>RegExr</b></a> - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).<br>
:small_orange_diamond: <ahref="https://gchq.github.io/CyberChef/"><b>The Cyber Swiss Army Knife</b></a> - a web app for encryption, encoding, compression and data analysis.<br>
:small_orange_diamond: <ahref="https://toolbar.netcraft.com/site_report"><b>Netcraft</b></a> - detailed report about the site, helping you to make informed choices about their integrity.<b>*</b><br>
:small_orange_diamond: <ahref="https://www.ripe.net/"><b>RIPE NCC</b></a> - not-for-profit membership association, a Regional Internet Registry and the secretariat for the RIPE.<br>
:small_orange_diamond: <ahref="https://www.robtex.com/"><b>Robtex</b></a> - uses various sources to gather public information about IP numbers, domain names, host names, routes etc.<br>
:small_orange_diamond: <ahref="https://riseup.net/"><b>Riseup</b></a> - provides online communication tools for people and groups working on liberatory social change.<br>
:small_orange_diamond: <ahref="https://www.virustotal.com/gui/home/upload"><b>VirusTotal</b></a> - analyze suspicious files and URLs to detect types of malware.<br>
:small_orange_diamond: <ahref="https://www.privacytools.io/"><b>privacytools.io</b></a> - provides knowledge and tools to protect your privacy against global mass surveillance.<br>
:small_orange_diamond: <ahref="https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers"><b>DNS Privacy Test Servers</b></a> - DNS privacy recursive servers list (with a 'no logging' policy).<br>
:small_orange_diamond: <ahref="http://sandbox.onlinephpfunctions.com/"><b>PHP Sandbox</b></a> - test your PHP code with this code tester.<br>
:small_orange_diamond: <ahref="https://www.repl.it/"><b>Repl.it</b></a> - an instant IDE to learn, build, collaborate, and host all in one place.<br>
:small_orange_diamond: <ahref="https://developers.google.com/speed/pagespeed/insights/"><b>PageSpeed Insights</b></a> - analyze your site’s speed and make it faster.<br>
:small_orange_diamond: <ahref="https://web.dev/"><b>web.dev</b></a> - helps developers like you learn and apply the web's modern capabilities to your own sites and apps.<br>
##### :black_small_square: Mass scanners (search engines)
<p>
:small_orange_diamond: <ahref="https://censys.io/"><b>Censys</b></a> - platform that helps information security practitioners discover, monitor, and analyze devices.<br>
:small_orange_diamond: <ahref="https://www.shodan.io/"><b>Shodan</b></a> - the world's first search engine for Internet-connected devices.<br>
:small_orange_diamond: <ahref="https://2000.shodan.io/#/"><b>Shodan 2000</b></a> - do you use Shodan for everyday work? This tool looks for randomly generated data from Shodan.<br>
:small_orange_diamond: <ahref="https://viz.greynoise.io/table"><b>GreyNoise</b></a> - mass scanner such as Shodan and Censys.<br>
:small_orange_diamond: <ahref="https://www.zoomeye.org/"><b>ZoomEye</b></a> - search engine for cyberspace that lets the user find specific network components.<br>
:small_orange_diamond: <ahref="https://fofa.so/"><b>FOFA</b></a> - is a cyberspace search engine.<br>
:small_orange_diamond: <ahref="https://www.onyphe.io/"><b>onyphe</b></a> - is a search engine for open-source and cyber threat intelligence data collected.<br>
:small_orange_diamond: <ahref="https://app.binaryedge.io/"><b>binaryedge</b></a> - it scan the entire internet space and create real-time threat intelligence streams and reports.<br>
:small_orange_diamond: <ahref="https://wigle.net/"><b>wigle</b></a> - is a submission-based catalog of wireless networks. All the networks. Found by Everyone.<br>
:small_orange_diamond: <ahref="https://publicwww.com/"><b>PublicWWW</b></a> - find any alphanumeric snippet, signature or keyword in the web pages HTML, JS and CSS code.<br>
:small_orange_diamond: <ahref="https://inteltechniques.com/menu.html"><b>IntelTechniques</b></a> - this repository contains hundreds of online search utilities.<br>
:small_orange_diamond: <ahref="https://hunter.io/"><b>hunter</b></a> - lets you find email addresses in seconds and connect with the people that matter for your business.<br>
:small_orange_diamond: <ahref="https://ghostproject.fr/"><b>GhostProject?</b></a> - search by full email address or username.<br>
:small_orange_diamond: <ahref="https://www.databreaches.live/"><b>databreaches</b></a> - was my email affected by data breach?<br>
:small_orange_diamond: <ahref="https://buckets.grayhatwarfare.com/"><b>Buckets by Grayhatwarfar</b></a> - database with public search for Open Amazon S3 Buckets and their contents.<br>
:small_orange_diamond: <ahref="https://vigilante.pw/"><b>Vigilante.pw</b></a> - the breached database directory.<br>
:small_orange_diamond: <ahref="https://builtwith.com/"><b>builtwith</b></a> - find out what websites are built with.<br>
:small_orange_diamond: <ahref="https://www.mmnt.net/"><b>Mamont's open FTP Index</b></a> - if a target has an open FTP site with accessible content it will be listed here.<br>
:small_orange_diamond: <ahref="https://osintframework.com/"><b>OSINT Framework</b></a> - focused on gathering information from free tools or resources.<br>
:small_orange_diamond: <ahref="https://www.maltiverse.com/search"><b>maltiverse</b></a> - is a service oriented to cybersecurity analysts for the advanced analysis of indicators of compromise.<br>
:small_orange_diamond: <ahref="https://leakedsource.ru/main/"><b>Leaked Source</b></a> - is a collaboration of data found online in the form of a lookup.<br>
:small_orange_diamond: <ahref="https://pipl.com/"><b>pipl</b></a> - is the place to find the person behind the email address, social username or phone number.<br>
:small_orange_diamond: <ahref="https://abuse.ch/"><b>abuse.ch</b></a> - is operated by a random swiss guy fighting malware for non-profit.<br>
:small_orange_diamond: <ahref="https://cybercrime-tracker.net/index.php"><b>Cybercrime Tracker</b></a> - monitors and tracks various malware families that are used to perpetrate cyber crimes.<br>
:small_orange_diamond: <ahref="https://nerdydata.com/"><b>NerdyData</b></a> - search source code across 65 million websites.<br>
:small_orange_diamond: <ahref="https://searchcode.com/"><b>searchcode</b></a> - helping you find real world examples of functions, API's and libraries.<br>
:small_orange_diamond: <ahref="http://www.insecam.org/"><b>Insecam</b></a> - the world biggest directory of online surveillance security cameras.<br>
:small_orange_diamond: <ahref="https://gotcha.pw/"><b>Gotcha?</b></a> - list of 1.4 billion accounts circulates around the Internet.<b>*</b><br>
:small_orange_diamond: <ahref="https://haveibeenpwned.com/"><b>have i been pwned?</b></a> - check if you have an account that has been compromised in a data breach.<br>
:small_orange_diamond: <ahref="https://www.exploit-db.com/"><b>Exploit DB</b></a> - CVE compliant archive of public exploits and corresponding vulnerable software.<br>
:small_orange_diamond: <ahref="https://0day.today/"><b>0day.today</b></a> - exploits market provides you the possibility to buy zero-day exploits and also to sell 0day exploits.<br>
:small_orange_diamond: <ahref="https://sploitus.com/"><b>sploitus</b></a> - the exploit and tools database.<br>
:small_orange_diamond: <ahref="https://www.vulncode-db.com/"><b>Vulncode-DB</b></a> - is a database for vulnerabilities and their corresponding source code if available.<br>
:small_orange_diamond: <ahref="https://www.immuniweb.com/mobile/"><b>ImmuniWeb® Mobile App Scanner</b></a> - test security and privacy of mobile apps (iOS & Android).<br>
:small_orange_diamond: <ahref="https://www.ostorlab.co/scan/mobile/"><b>Ostorlab</b></a> - analyzes mobile application to identify vulnerabilities and potential weaknesses.<br>
:small_orange_diamond: <ahref="https://countermail.com/"><b>CounterMail</b></a> - is a secure and easy to use online email service, designed to provide maximum security and privacy.<br>
:small_orange_diamond: <ahref="http://mail2tor.com/"><b>Mail2Tor</b></a> - is a Tor Hidden Service that allows anyone to send and receive emails anonymously.<br>
:small_orange_diamond: <ahref="https://tutanota.com/"><b>Tutanota</b></a> - is the world's most secure email service and amazingly easy to use.<br>
:small_orange_diamond: <ahref="https://protonmail.com/"><b>Protonmail</b></a> - is the world's largest secure email service, developed by CERN and MIT scientists.<br>
:small_orange_diamond: <ahref="https://keyserver.ubuntu.com/"><b>SKS OpenPGP Key server</b></a> - services for the SKS keyservers used by OpenPGP.<br>
:small_orange_diamond: <ahref="https://hardenedbsd.org/"><b>HardenedBSD</b></a> - HardenedBSD aims to implement innovative exploit mitigation and security solutions.<br>
:small_orange_diamond: <ahref="https://www.kali.org/"><b>Kali Linux</b></a> - Linux distribution used for Penetration Testing, Ethical Hacking and network security assessments.<br>
:small_orange_diamond: <ahref="https://www.backbox.org/"><b>Backbox Linux</b></a> - penetration test and security assessment oriented Ubuntu-based Linux distribution.<br>
:small_orange_diamond: <ahref="https://blackarch.org/"><b>BlackArch</b></a> - is an Arch Linux-based penetration testing distribution for penetration testers and security researchers.<br>
:small_orange_diamond: <ahref="https://securityonion.net/"><b>Security Onion</b></a> - Linux distro for intrusion detection, enterprise security monitoring, and log management.<br>
:small_orange_diamond: <ahref="https://tails.boum.org/"><b>Tails</b></a> - is a live system that aims to preserve your privacy and anonymity.<br>
:small_orange_diamond: <ahref="https://varnish-cache.org/"><b>Varnish Cache</b></a> - HTTP accelerator designed for content-heavy dynamic web sites.<br>
:small_orange_diamond: <ahref="https://nginx.org/"><b>Nginx</b></a> - open source web and reverse proxy server that is similar to Apache, but very light weight.<br>
:small_orange_diamond: <ahref="https://github.com/alibaba/tengine"><b>Tengine</b></a> - a distribution of Nginx with some advanced features.<br>
:small_orange_diamond: <ahref="https://caddyserver.com/"><b>Caddy Server</b></a> - is an open source, HTTP/2-enabled web server with HTTPS by default.<br>
:small_orange_diamond: <ahref="https://www.knot-resolver.cz/"><b>Knot Resolver</b></a> - caching full resolver implementation, including both a resolver library and a daemon.<br>
:small_orange_diamond: <ahref="https://www.powerdns.com/"><b>PowerDNS</b></a> - is an open source authoritative DNS server, written in C++ and licensed under the GPL.<br>
:small_orange_diamond: <ahref="https://emeraldonion.org/"><b>Emerald Onion</b></a> - is a 501(c)(3) nonprofit organization and transit internet service provider (ISP) based in Seattle.<br>
:small_orange_diamond: <ahref="https://github.com/pi-hole/pi-hole"><b>pi-hole</b></a> - the Pi-hole® is a DNS sinkhole that protects your devices from unwanted content.<br>
:small_orange_diamond: <ahref="https://github.com/Netflix/security_monkey"><b>security_monkey</b></a> - monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time.<br>
:small_orange_diamond: <ahref="https://www.capanalysis.net/ca/"><b>CapAnalysis</b></a> - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer).<br>
:small_orange_diamond: <ahref="https://github.com/digitalocean/netbox"><b>netbox</b></a> - IP address management (IPAM) and data center infrastructure management (DCIM) tool.<br>
:small_orange_diamond: <ahref="https://labs.networkreliability.engineering/"><b>NRE Labs</b></a> - learn automation by doing it. Right now, right here, in your browser.<br>
:small_orange_diamond: <ahref="https://ee.lbl.gov/"><b>LBNL's Network Research Group</b></a> - home page of the Network Research Group (NRG); tools, talks, papers and more.<br>
:small_orange_diamond: <ahref="https://github.com/dylanaraps/pure-bash-bible"><b>pure-bash-bible</b></a> - a collection of pure bash alternatives to external processes.<br>
:small_orange_diamond: <ahref="https://wiki.bash-hackers.org/start"><b>The Bash Hackers Wiki</b></a> - hold documentation of any kind about GNU Bash.<br>
:small_orange_diamond: <ahref="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/contents.html"><b>Shell & Utilities</b></a> - describes the commands and utilities offered to application programs by POSIX-conformant systems.<br>
:small_orange_diamond: <ahref="https://github.com/jlevy/the-art-of-command-line"><b>the-art-of-command-line</b></a> - master the command line, in one page.<br>
:small_orange_diamond: <ahref="https://awesome-python.com/"><b>Awesome Python</b></a> - a curated list of awesome Python frameworks, libraries, software and resources.<br>
:small_orange_diamond: <ahref="https://posts.specterops.io/fawk-yeah-advanced-sed-and-awk-usage-parsing-for-pentesters-3-e5727e11a8ad?gi=c8f9506b26b6"><b>F’Awk Yeah!</b></a> - advanced sed and awk usage (Parsing for Pentesters 3).<br>
:small_orange_diamond: <ahref="https://www.cyberciti.biz/"><b>nixCraft</b></a> - linux and unix tutorials for new and seasoned sysadmin.<br>
:small_orange_diamond: <ahref="http://www.omnisecu.com/index.php"><b>Omnisecu</b></a> - free Networking, System Administration and Security tutorials.<br>
:small_orange_diamond: <ahref="http://cb.vu/unixtoolbox.xhtml"><b>Unix Toolbox</b></a> - collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users.<br>
:small_orange_diamond: <ahref="https://linuxguideandhints.com/"><b>Linux Guide and Hints</b></a> - tutorials on system administration in Fedora and CentOS.<br>
:small_orange_diamond: <ahref="https://github.com/NanXiao/strace-little-book"><b>strace-little-book</b></a> - a little book which introduces strace.<br>
:small_orange_diamond: <ahref="https://github.com/bagder/http2-explained"><b>http2-explained</b></a> - a detailed document explaining and documenting HTTP/2.<br>
:small_orange_diamond: <ahref="https://github.com/bagder/http3-explained"><b>http3-explained</b></a> - a document describing the HTTP/3 and QUIC protocols.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/nginx-admins-handbook"><b>Nginx Admin's Handbook</b></a> - describes how to improve NGINX performance, security and other important things.<br>
:small_orange_diamond: <ahref="https://infosec.mozilla.org/guidelines/openssh"><b>openssh guideline</b></a> - is to help operational teams with the configuration of OpenSSH server and client.<br>
:small_orange_diamond: <ahref="https://github.com/donnemartin/system-design-primer"><b>The System Design Primer</b></a> - learn how to design large-scale systems.<br>
:small_orange_diamond: <ahref="https://github.com/binhnguyennus/awesome-scalability"><b>Awesome Scalability</b></a> - best practices in building High Scalability, High Availability, High Stability and more.<br>
:small_orange_diamond: <ahref="https://www.cisecurity.org/cis-benchmarks/"><b>CIS Benchmarks</b></a> - are secure configuration settings for over 100 technologies, available as a free PDF download.<br>
:small_orange_diamond: <ahref="https://iase.disa.mil/stigs/Pages/index.aspx"><b>STIGs</b></a> - are the configuration standards for DOD IA and IA-enabled devices/systems.<br>
:small_orange_diamond: <ahref="https://highon.coffee/blog/security-harden-centos-7/"><b>Security Harden CentOS 7</b></a> - this walks you through the steps required to security harden CentOS.<br>
:small_orange_diamond: <ahref="https://www.lisenet.com/2017/centos-7-server-hardening-guide/"><b>CentOS 7 Server Hardening Guide</b></a> - great guide for hardening CentOS; familiar with OpenSCAP.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/the-practical-linux-hardening-guide"><b>The Practical Linux Hardening Guide</b></a> - provides a high-level overview of hardening GNU/Linux systems.<br>
:small_orange_diamond: <ahref="https://github.com/toniblyx/my-arsenal-of-aws-security-tools"><b>AWS security tools</b></a> - make your AWS cloud environment more secure.<br>
:small_orange_diamond: <ahref="https://inventory.rawsec.ml/index.html"><b>Rawsec's CyberSecurity Inventory</b></a> - an inventory of tools and resources about CyberSecurity.<br>
:small_orange_diamond: <ahref="https://tls.ulfheim.net/"><b>The Illustrated TLS Connection</b></a> - every byte of a TLS connection explained and reproduced.<br>
:small_orange_diamond: <ahref="https://github.com/ssllabs/research/wiki/SSL-and-TLS-Deployment-Best-Practices"><b>SSL Research</b></a> - SSL and TLS Deployment Best Practices by SSL Labs.<br>
:small_orange_diamond: <ahref="https://smallstep.com/blog/everything-pki.html"><b>Certificates and PKI</b></a> - everything you should know about certificates and PKI but are too afraid to ask.<br>
:small_orange_diamond: <ahref="https://appsecco.com/books/subdomain-enumeration/"><b>The Art of Subdomain Enumeration</b></a> - a reference for subdomain enumeration techniques.<br>
:small_orange_diamond: <ahref="https://lifehacker.com/the-comprehensive-guide-to-quitting-google-1830001964"><b>Quitting Google</b></a> - the comprehensive guide to quitting Google.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/Main_Page"><b>OWASP</b></a> - worldwide not-for-profit charitable organization focused on improving the security of software.<br>
:small_orange_diamond: <ahref="https://github.com/Santandersecurityresearch/asvs"><b>OWASP ASVS 3.0.1 Web App</b></a> - simple web app that helps developers understand the ASVS requirements.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/ASVS/tree/master/4.0"><b>OWASP ASVS 4.0</b></a> - is a list of application security requirements or tests.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/DevGuide"><b>OWASP Dev Guide</b></a> - this is the development version of the OWASP Developer Guide.<br>
:small_orange_diamond: <ahref="https://infosec.mozilla.org/guidelines/web_security.html"><b>Mozilla Web Security</b></a> - help operational teams with creating secure web applications.<br>
:small_orange_diamond: <ahref="https://appsecwiki.com/#/"><b>Application Security Wiki</b></a> - is an initiative to provide all application security related resources at one place.<br>
:small_orange_diamond: <ahref="https://github.com/GrrrDog/weird_proxies/wiki"><b>Weird Proxies</b></a> - reverse proxy related attacks; it is a result of analysis of various reverse proxies, cache proxies, etc.<br>
:small_orange_diamond: <ahref="https://dfir.it/blog/2015/08/12/webshell-every-time-the-same-purpose/"><b>Webshells</b></a> - great series about malicious payloads.<br>
:small_orange_diamond: <ahref="https://portswigger.net/blog/practical-web-cache-poisoning"><b>Practical Web Cache Poisoning</b></a> - show you how to compromise websites by using esoteric web features.<br>
:small_orange_diamond: <ahref="https://github.com/bl4de/research/tree/master/hidden_directories_leaks"><b>Hidden directories and files</b></a> - as a source of sensitive information about web application.<br>
:small_orange_diamond: <ahref="https://www.netsparker.com/security-cookies-whitepaper/"><b>Security Cookies</b></a> - this paper will take a close look at cookie security.<br>
:small_orange_diamond: <ahref="https://github.com/GitGuardian/APISecurityBestPractices"><b>APISecurityBestPractices</b></a> - help you keep secrets (API keys, db credentials, certificates) out of source code.<br>
:small_orange_diamond: <ahref="https://devhints.io/"><b>Rico's cheatsheets</b></a> - this is a modest collection of cheatsheets.<br>
:small_orange_diamond: <ahref="https://devdocs.io/"><b>DevDocs API</b></a> - combines multiple API documentations in a fast, organized, and searchable interface.<br>
:small_orange_diamond: <ahref="https://bitvijays.github.io/LFC-VulnerableMachines.html"><b>CTF Series : Vulnerable Machines</b></a> - the steps below could be followed to find vulnerabilities and exploits.<br>
:small_orange_diamond: <ahref="https://github.com/manoelt/50M_CTF_Writeup"><b>50M_CTF_Writeup</b></a> - $50 million CTF from Hackerone - writeup.<br>
:small_orange_diamond: <ahref="https://github.com/j00ru/ctf-tasks"><b>ctf-tasks</b></a> - an archive of low-level CTF challenges developed over the years.<br>
:small_orange_diamond: <ahref="https://hshrzd.wordpress.com/how-to-start/"><b>How to start RE/malware analysis?</b></a> - collection of some hints and useful links for the beginners.<br>
:small_orange_diamond: <ahref="http://www.kegel.com/c10k.html"><b>The C10K problem</b></a> - it's time for web servers to handle ten thousand clients simultaneously, don't you think?<br>
:small_orange_diamond: <ahref="https://bankgradesecurity.com/"><b>Bank Grade Security</b></a> - when companies say they have "Bank Grade Security" they imply that it is a good thing.<b>*</b><br>
:small_orange_diamond: <ahref="https://nickcraver.com/blog/2017/05/22/https-on-stack-overflow/"><b>HTTPS on Stack Overflow</b></a> - this is the story of a long journey regarding the implementation of SSL.<br>
:small_orange_diamond: <ahref="https://drawings.jvns.ca/"><b>Julia's Drawings</b></a> - some drawings about programming and unix world, zines about systems & debugging tools.<br>
:small_orange_diamond: <ahref="https://github.com/corkami/collisions"><b>Hash collisions</b></a> - this great repository is focused on hash collisions exploitation.<br>
:small_orange_diamond: <ahref="https://labs.ripe.net/Members/cteusche/bgp-meets-cat"><b>BGP Meets Cat</b></a> - after 3072 hours of manipulating BGP, Job Snijders has succeeded in drawing a Nyancat.<br>
:small_orange_diamond: <ahref="https://robertheaton.com/2018/11/28/https-in-the-real-world/"><b>HTTPS in the real world</b></a> - great tutorial explain how HTTPS works in the real world.<br>
:small_orange_diamond: <ahref="https://about.gitlab.com/2018/11/14/how-we-spent-two-weeks-hunting-an-nfs-bug/"><b>Gitlab and NFS bug</b></a> - how we spent two weeks hunting an NFS bug in the Linux kernel.<br>
:small_orange_diamond: <ahref="http://www.catb.org/esr/faqs/hacker-howto.html"><b>How To Become A Hacker</b></a> - if you want to be a hacker, keep reading.<br>
:small_orange_diamond: <ahref="http://ithare.com/infographics-operation-costs-in-cpu-clock-cycles/"><b>Operation Costs in CPU</b></a> - an infographics which should help to estimate costs of certain operations in CPU clocks.<br>
:small_orange_diamond: <ahref="https://cstack.github.io/db_tutorial/"><b>Let's Build a Simple Database</b></a> - writing a sqlite clone from scratch in C.<br>
:small_orange_diamond: <ahref="https://djhworld.github.io/post/2019/05/21/i-dont-know-how-cpus-work-so-i-simulated-one-in-code/"><b>simple-computer</b></a> - great resource to understand how computers work under the hood.<br>
:small_orange_diamond: <ahref="https://github.com/learnbyexample/Command-line-text-processing"><b>Command-line-text-processing</b></a> - from finding text to search and replace, from sorting to beautifying text and more.<br>
:small_orange_diamond: <ahref="https://github.com/caesar0301/awesome-pcaptools"><b>Awesome Pcaptools</b></a> - collection of tools developed by other researchers to process network traces.<br>
:small_orange_diamond: <ahref="https://github.com/zoidbergwill/awesome-ebpf"><b>awesome-ebpf</b></a> - a curated list of awesome projects related to eBPF.<br>
:small_orange_diamond: <ahref="https://github.com/leandromoreira/linux-network-performance-parameters"><b>Linux Network Performance</b></a> - learn where some of the network sysctl variables fit into the Linux/Kernel network flow.<br>
:small_orange_diamond: <ahref="https://github.com/dhamaniasad/awesome-postgres"><b>Awesome Postgres</b></a> - list of awesome PostgreSQL software, libraries, tools and resources.<br>
:small_orange_diamond: <ahref="https://github.com/enochtangg/quick-SQL-cheatsheet"><b>quick-SQL-cheatsheet</b></a> - a quick reminder of all SQL queries and examples on how to use them.<br>
:small_orange_diamond: <ahref="https://github.com/Kickball/awesome-selfhosted"><b>Awesome-Selfhosted</b></a> - list of Free Software network services and web applications which can be hosted locally.<br>
:small_orange_diamond: <ahref="https://github.com/kelseyhightower/kubernetes-the-hard-way"><b>kubernetes-the-hard-way</b></a> - bootstrap Kubernetes the hard way on Google Cloud Platform. No scripts.<br>
:small_orange_diamond: <ahref="https://github.com/jamesward/kubernetes-the-easy-way"><b>kubernetes-the-easy-way</b></a> - bootstrap Kubernetes the easy way on Google Cloud Platform. No scripts.<br>
:small_orange_diamond: <ahref="https://wiki.archlinux.org/index.php/List_of_applications"><b>List of applications</b></a> - huge collection of applications sorted by category, as a reference for those looking for packages. <br>
:small_orange_diamond: <ahref="https://github.com/thedaviddias/Front-End-Checklist"><b>Front-End-Checklist</b></a> - the perfect Front-End Checklist for modern websites and meticulous developers.<br>
:small_orange_diamond: <ahref="https://rszalski.github.io/magicmethods/"><b>Python's Magic Methods</b></a> - what are magic methods? They're everything in object-oriented Python.<br>
:small_orange_diamond: <ahref="https://github.com/satwikkansal/wtfpython"><b>wtfpython</b></a> - a collection of surprising Python snippets and lesser-known features.<br>
:small_orange_diamond: <ahref="https://github.com/twhite96/js-dev-reads"><b>js-dev-reads</b></a> - a list of books and articles for the discerning web developer to read.<br>
:small_orange_diamond: <ahref="https://github.com/RomuloOliveira/commit-messages-guide"><b>Commit messages guide</b></a> - a guide to understand the importance of commit messages.<br>
:small_orange_diamond: <ahref="https://github.com/qazbnm456/awesome-web-security"><b>Awesome Web Security</b></a> - a curated list of Web Security materials and resources.<br>
:small_orange_diamond: <ahref="https://github.com/joe-shenouda/awesome-cyber-skills"><b>awesome-cyber-skills</b></a> - a curated list of hacking environments where you can train your cyber skills.<br>
:small_orange_diamond: <ahref="https://github.com/hslatman/awesome-threat-intelligence"><b>awesome-threat-intelligence</b></a> - a curated list of Awesome Threat Intelligence resources.<br>
:small_orange_diamond: <ahref="https://github.com/infosecn1nja/Red-Teaming-Toolkit"><b>Red-Teaming-Toolkit</b></a> - a collection of open source and commercial tools that aid in red team operations.<br>
:small_orange_diamond: <ahref="https://github.com/snoopysecurity/awesome-burp-extensions"><b>awesome-burp-extensions</b></a> - a curated list of amazingly awesome Burp Extensions.<br>
:small_orange_diamond: <ahref="https://github.com/Hack-with-Github/Free-Security-eBooks"><b>Free Security eBooks</b></a> - list of a Free Security and Hacking eBooks.<br>
:small_orange_diamond: <ahref="https://github.com/wtsxDev/reverse-engineering"><b>reverse-engineering</b></a> - list of awesome reverse engineering resources.<br>
:small_orange_diamond: <ahref="https://github.com/michalmalik/linux-re-101"><b>linux-re-101</b></a> - a collection of resources for linux reverse engineering.<br>
:small_orange_diamond: <ahref="https://github.com/onethawt/reverseengineering-reading-list"><b>reverseengineering-reading-list</b></a> - a list of Reverse Engineering articles, books, and papers.<br>
:small_orange_diamond: <ahref="https://github.com/0xInfection/Awesome-WAF"><b>Awesome-WAF</b></a> - a curated list of awesome web-app firewall (WAF) stuff.<br>
:small_orange_diamond: <ahref="https://github.com/danielmiessler/RobotsDisallowed"><b>RobotsDisallowed</b></a> - a curated list of the most common and most interesting robots.txt disallowed directories.<br>
:small_orange_diamond: <ahref="https://github.com/k4m4/movies-for-hackers"><b>Movies for Hackers</b></a> - list of movies every hacker & cyberpunk must watch.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/technical-whitepapers"><b>technical-whitepapers</b></a> - IT whitepapers; hacking, web app security, db, reverse engineering and more; EN/PL.<br>
:small_orange_diamond: <ahref="https://www.cheatography.com/"><b>Cheatography</b></a> - over 3,000 free cheat sheets, revision aids and quick references.<br>
:small_orange_diamond: <ahref="https://github.com/mre/awesome-static-analysis"><b>awesome-static-analysis</b></a> - static analysis tools for all programming languages.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=nAFpkV5-vuI"><b>Varnish for PHP developers</b></a> - very interesting presentation of Varnish by Mattias Geniar.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=CZ3wIuvmHeM"><b>A Netflix Guide to Microservices</b></a> - Josh Evans talks about the chaotic and vibrant world of microservices at Netflix.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=yOyaJXpAYZQ"><b>Comparing C to machine language</b></a> - compare a simple C program with the compiled machine code of that program.<br>
:small_orange_diamond: <ahref="http://www.brendangregg.com/"><b>Brendan Gregg's Blog</b></a> - is an industry expert in computing performance and cloud computing.<br>
:small_orange_diamond: <ahref="https://gynvael.coldwind.pl/"><b>Gynvael "GynDream" Coldwind</b></a> - is a IT security engineer at Google.<br>
:small_orange_diamond: <ahref="http://lcamtuf.coredump.cx/"><b>Michał "lcamtuf" Zalewski</b></a> - white hat hacker, computer security expert.<br>
:small_orange_diamond: <ahref="https://ma.ttias.be/"><b>Mattias Geniar</b></a> - developer, sysadmin, blogger, podcaster and public speaker.<br>
:small_orange_diamond: <ahref="https://nickcraver.com/"><b>Nick Craver</b></a> - software developer and systems administrator for Stack Exchange.<br>
:small_orange_diamond: <ahref="https://scotthelme.co.uk/"><b>Scott Helme</b></a> - security researcher, international speaker and founder of securityheaders.com and report-uri.com.<br>
:small_orange_diamond: <ahref="https://krebsonsecurity.com/"><b>Brian Krebs</b></a> - The Washington Post and now an Independent investigative journalist.<br>
:small_orange_diamond: <ahref="https://www.schneier.com/"><b>Bruce Schneier</b></a> - is an internationally renowned security technologist, called a "security guru".<br>
:small_orange_diamond: <ahref="https://chrissymorgan.co.uk/"><b>Chrissy Morgan</b></a> - advocate of practical learning, Chrissy also takes part in bug bounty programs.<br>
:small_orange_diamond: <ahref="https://blog.zsec.uk/"><b>Andy Gill</b></a> - is a hacker at heart who works as a senior penetration tester.<br>
:small_orange_diamond: <ahref="https://www.j4vv4d.com/"><b>Javvad Malik</b></a> - is a security advocate at AlienVault, a blogger event speaker and industry commentator.<br>
:small_orange_diamond: <ahref="https://security.szurek.pl/"><b>Kacper Szurek</b></a> - detection engineer at ESET.<br>
:small_orange_diamond: <ahref="https://www.troyhunt.com/"><b>Troy Hunt</b></a> - web security expert known for public education and outreach on security topics.<br>
:small_orange_diamond: <ahref="https://raymii.org/s/index.html"><b>raymii.org</b></a> - sysadmin specializing in building high availability cloud environments.<br>
:small_orange_diamond: <ahref="https://robert.penz.name/"><b>Robert Penz</b></a> - IT security expert.<br>
:small_orange_diamond: <ahref="https://linux-audit.com/"><b>Linux Audit</b></a> - the Linux security blog about auditing, hardening and compliance by Michael Boelen.<br>
:small_orange_diamond: <ahref="http://www.grymoire.com/"><b>The Grymoire</b></a> - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.<br>
:small_orange_diamond: <ahref="https://portswigger.net/blog"><b>PortSwigger Web Security Blog</b></a> - about web app security vulns and top tips from our team of web security.<br>
:small_orange_diamond: <ahref="https://www.secjuice.com"><b>Secjuice</b></a> - is the only non-profit, independent and volunteer led publication in the information security space.<br>
:small_orange_diamond: <ahref="https://duo.com/decipher"><b>Decipher</b></a> - security news that informs and inspires.<br>
</p>
##### :black_small_square: Geeky Vendor Blogs
<p>
:small_orange_diamond: <ahref="https://www.tenable.com/podcast"><b>Tenable Podcast</b></a> - conversations and interviews related to Cyber Exposure, and more.<br>
:small_orange_diamond: <ahref="https://nakedsecurity.sophos.com/"><b>Sophos</b></a> - threat news room, giving you news, opinion, advice and research on computer security issues.<br>
:small_orange_diamond: <ahref="https://www.tripwire.com/state-of-security/"><b>Tripwire State of Security</b></a> - blog featuring the latest news, trends and insights on current information security issues.<br>
:small_orange_diamond: <ahref="https://blog.malwarebytes.com/"><b>Malwarebytes Labs Blog</b></a> - security blog aims to provide insider news about cybersecurity.<br>
:small_orange_diamond: <ahref="https://www.trustedsec.com/category/articles/"><b>TrustedSec</b></a> - latest news, and trends about cybersecurity.<br>
:small_orange_diamond: <ahref="https://thycotic.com/company/blog/"><b>Thycotic</b></a> - where CISOs and IT Admins come to learn about industry trends, IT security, data breaches, and more.<br>
:small_orange_diamond: <ahref="https://risky.biz/netcasts/risky-business/"><b>Risky Business</b></a> - is a weekly information security podcast featuring news and in-depth interviews.<br>
:small_orange_diamond: <ahref="https://www.vice.com/en_us/topic/cyber"><b>Cyber, by Motherboard</b></a> - stories, and focus on the ideas about cybersecurity.<br>
:small_orange_diamond: <ahref="https://www.tenable.com/podcast"><b>Tenable Podcast</b></a> - conversations and interviews related to Cyber Exposure, and more.<br>
Cybercrime Investigations</b></a> - podcast by Geoff White about cybercrimes.<br>
:small_orange_diamond: <ahref="https://themanyhats.club/tag/episodes/"><b>The many hats club</b></a> - featuring stories from a wide range of Infosec people (Whitehat, Greyhat and Blackhat).<br>
:small_orange_diamond: <ahref="https://darknetdiaries.com/"><b>Darknet Diaries</b></a> - true stories from the dark side of the Internet.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/playlist?list=PL423I_gHbWUXah3dmt_q_XNp0NlGAKjis"><b>OSINTCurious Webcasts</b></a> - is the investigative curiousity that helps people be successful in OSINT.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w"><b>LiveOverflow</b></a> - a lot more advanced topics than what is typically offered in paid online courses - but for free.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/infoseccynic"><b>J4vv4D</b></a> - the important information regarding our internet security.<br>
:small_orange_diamond: <ahref="https://twitter.com/MarcoCiappelli"><b>@MarcoCiappelli</b></a> - Co-Founder @ITSPmagazine, at the intersection of IT security and society.<br>
:small_orange_diamond: <ahref="https://twitter.com/binitamshah"><b>@binitamshah</b></a> - Linux Evangelist. Malwares. Kernel Dev. Security Enthusiast.<br>
:small_orange_diamond: <ahref="https://twitter.com/joe_carson"><b>@joe_carson</b></a> - an InfoSec Professional and Tech Geek.<br>
##### :black_small_square: Best Commercial Twitter Accounts
<p>
:small_orange_diamond: <ahref="https://twitter.com/haveibeenpwned"><b>@haveibeenpwned</b></a> - check if you have an account that has been compromised in a data breach.<br>
:small_orange_diamond: <ahref="https://twitter.com/bugcrowd"><b>@bugcrowd</b></a> - trusted by more of the Fortune 500 than any other crowdsourced security platform.<br>
:small_orange_diamond: <ahref="https://twitter.com/Malwarebytes"><b>@Malwarebytes</b></a> - most trusted security company. Unmatched threat visibility.<br>
:small_orange_diamond: <ahref="https://twitter.com/sansforensics"><b>@sansforensics</b></a> - the world's leading Digital Forensics and Incident Response provider.<br>
:small_orange_diamond: <ahref="https://twitter.com/TheManyHatsClub"><b>@TheManyHatsClub</b></a> - an information security focused podcast and group of individuals from all walks of life.<br>
:small_orange_diamond: <ahref="https://twitter.com/hedgehogsec"><b>@hedgehogsec</b></a> - Hedgehog Cyber. Gibraltar and Manchester's top boutique information security firm.<br>
:small_orange_diamond: <ahref="https://twitter.com/NCSC"><b>@NCSC</b></a> - the National Cyber Security Centre. Helping to make the UK the safest place to live and work online.<br>
:small_orange_diamond: <ahref="http://ftp.arl.army.mil/~mike/howto/"><b>How to Do Things at ARL</b></a> - how to configure modems, scan images, record CD-ROMs, and other useful techniques.<b>*</b><br>
:small_orange_diamond: <ahref="http://www.syhunt.com/sandcat/"><b>Sandcat Browser</b></a> - a penetration-oriented browser with plenty of advanced functionality already built in.<br>
:small_orange_diamond: <ahref="https://www.metasploit.com/"><b>Metasploit</b></a> - tool and framework for pentesting system, web and many more, contains a lot a ready to use exploit.<br>
:small_orange_diamond: <ahref="https://portswigger.net/burp"><b>Burp Suite</b></a> - tool for testing web application security, intercepting proxy to replay, inject, scan and fuzz HTTP requests.<br>
:small_orange_diamond: <ahref="https://mitmproxy.org/"><b>mitmproxy</b></a> - an interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.<br>
:small_orange_diamond: <ahref="https://cirt.net/Nikto2"><b>Nikto2</b></a> - web server scanner which performs comprehensive tests against web servers for multiple items.<br>
:small_orange_diamond: <ahref="http://sqlmap.org/"><b>sqlmap</b></a> - tool that automates the process of detecting and exploiting SQL injection flaws.<br>
:small_orange_diamond: <ahref="https://github.com/Ekultek/WhatWaf"><b>WhatWaf</b></a> - detect and bypass web application firewalls and protection systems.<br>
:small_orange_diamond: <ahref="https://www.openwall.com/john/"><b>John The Ripper</b></a> - is a fast password cracker, currently available for many flavors of Unix, Windows, and other.<br>
:small_orange_diamond: <ahref="https://hashcat.net/hashcat/"><b>hashcat</b></a> - world's fastest and most advanced password recovery utility.<br>
:small_orange_diamond: <ahref="http://lcamtuf.coredump.cx/p0f3/"><b>p0f</b></a> - is a tool to identify the players behind any incidental TCP/IP communications.<br>
:small_orange_diamond: <ahref="https://bitbucket.org/LaNMaSteR53/recon-ng"><b>Recon-ng</b></a> - is a full-featured Web Reconnaissance framework written in Python.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/ssh_scan"><b>ssh_scan</b></a> - a prototype SSH configuration and policy scanner.<br>
:small_orange_diamond: <ahref="https://github.com/offensive-security/exploitdb"><b>exploitdb</b></a> - searchable archive from The Exploit Database.<br>
:small_orange_diamond: <ahref="https://github.com/zardus/ctf-tools"><b>ctf-tools</b></a> - some setup scripts for security research tools.<br>
:small_orange_diamond: <ahref="https://github.com/Gallopsled/pwntools"><b>pwntools</b></a> - CTF framework and exploit development library.<br>
:small_orange_diamond: <ahref="https://github.com/bl4de/security-tools"><b>security-tools</b></a> - collection of small security tools created mostly in Python. CTFs, pentests and so on.<br>
:small_orange_diamond: <ahref="https://github.com/fuzzdb-project/fuzzdb"><b>fuzzdb</b></a> - dictionary of attack patterns and primitives for black-box application fault injection and resource discovery.<br>
:small_orange_diamond: <ahref="https://github.com/google/syzkaller"><b>syzkaller</b></a> - is an unsupervised, coverage-guided kernel fuzzer.<br>
:small_orange_diamond: <ahref="https://github.com/pwndbg/pwndbg"><b>pwndbg</b></a> - exploit development and reverse engineering with GDB made easy.<br>
:small_orange_diamond: <ahref="https://www.hex-rays.com/products/ida/index.shtml"><b>IDA</b></a> - multi-processor disassembler and debugger useful for reverse engineering malware.<br>
:small_orange_diamond: <ahref="https://github.com/radare/radare2"><b>radare2</b></a> - framework for reverse-engineering and analyzing binaries.<br>
:small_orange_diamond: <ahref="https://github.com/NationalSecurityAgency/ghidra"><b>Ghidra</b></a> - is a software reverse engineering (SRE) framework.<br>
:small_orange_diamond: <ahref="https://github.com/sc0tfree/mentalist"><b>Mentalist</b></a> - is a graphical tool for custom wordlist generation.<br>
:small_orange_diamond: <ahref="https://github.com/archerysec/archerysec"><b>archerysec</b></a> - vulnerability assessment and management helps to perform scans and manage vulnerabilities.<br>
:small_orange_diamond: <ahref="https://github.com/beefproject/beef"><b>beef</b></a> - the browser exploitation framework project.<br>
:small_orange_diamond: <ahref="https://github.com/NullArray/AutoSploit"><b>AutoSploit</b></a> - automated mass exploiter.<br>
</p>
##### :black_small_square: Backdoors/exploits
<p>
:small_orange_diamond: <ahref="https://github.com/bartblaze/PHP-backdoors"><b>PHP-backdoors</b></a> - a collection of PHP backdoors. For educational or testing purposes only.<br>
:small_orange_diamond: <ahref="https://www.amanhardikar.com/mindmaps/Practice.html"><b>Pentests MindMap</b></a> - amazing mind map with vulnerable apps and systems.<br>
:small_orange_diamond: <ahref="https://www.amanhardikar.com/mindmaps/webapptest.html"><b>WebApps Security Tests MindMap</b></a> - incredible mind map for WebApps security tests.<br>
:small_orange_diamond: <ahref="https://brutelogic.com.br/blog/"><b>Brute XSS</b></a> - master the art of Cross Site Scripting.<br>
:small_orange_diamond: <ahref="https://jivoi.github.io/2015/07/03/offensive-security-bookmarks/"><b>Offensive Security Bookmarks</b></a> - security bookmarks collection, all that things I need to pass OSCP.<br>
:small_orange_diamond: <ahref="https://github.com/coreb1t/awesome-pentest-cheat-sheets"><b>Awesome Pentest Cheat Sheets</b></a> - collection of the cheat sheets useful for pentesting.<br>
:small_orange_diamond: <ahref="https://github.com/Hack-with-Github/Awesome-Hacking"><b>Awesome Hacking by HackWithGithub</b></a> - awesome lists for hackers, pentesters and security researchers.<br>
:small_orange_diamond: <ahref="https://github.com/carpedm20/awesome-hacking"><b>Awesome Hacking by carpedm20</b></a> - a curated list of awesome hacking tutorials, tools and resources.<br>
:small_orange_diamond: <ahref="https://github.com/vitalysim/Awesome-Hacking-Resources"><b>Awesome Hacking Resources</b></a> - collection of hacking/penetration testing resources to make you better.<br>
:small_orange_diamond: <ahref="https://github.com/enaqx/awesome-pentest"><b>Awesome Pentest</b></a> - collection of awesome penetration testing resources, tools and other shiny things.<br>
:small_orange_diamond: <ahref="https://jdow.io/blog/2018/03/18/web-application-penetration-testing-methodology/"><b>Web App Pentesting Cheat Sheet</b></a> - the typical steps performed when conducting a web application penetration test.<b>*</b><br>
:small_orange_diamond: <ahref="https://github.com/The-Art-of-Hacking/h4cker"><b>Cyber Security Resources</b></a> - includes thousands of cybersecurity-related references and resources.<br>
:small_orange_diamond: <ahref="https://github.com/jhaddix/pentest-bookmarks"><b>Pentest Bookmarks</b></a> - there are a LOT of pentesting blogs.<br>
:small_orange_diamond: <ahref="https://github.com/swisskyrepo/PayloadsAllTheThings"><b>PayloadsAllTheThings</b></a> - a list of useful payloads and bypass for Web Application Security and Pentest/CTF.<br>
:small_orange_diamond: <ahref="https://github.com/foospidy/payloads"><b>payloads</b></a> - git all the Payloads! A collection of web attack payloads.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/CheatSheetSeries/tree/master/cheatsheets"><b>OWASP Cheat Sheet Series</b></a> - collection of high value information on specific application security topics.<br>
:small_orange_diamond: <ahref="https://github.com/rshipp/awesome-malware-analysis"><b>Awesome Malware Analysis</b></a> - a curated list of awesome malware analysis tools and resources.<br>
:small_orange_diamond: <ahref="https://www.netsparker.com/blog/web-security/sql-injection-cheat-sheet/"><b>SQL Injection Cheat Sheet</b></a> - detailed technical information about the many different variants of the SQL Injection.<br>
:small_orange_diamond: <ahref="http://kb.entersoft.co.in/"><b>Entersoft Knowledge Base</b></a> - great and detailed reference about vulnerabilities.<br>
:small_orange_diamond: <ahref="http://html5sec.org/"><b>HTML5 Security Cheatsheet</b></a> - a collection of HTML5 related XSS attack vectors.<br>
:small_orange_diamond: <ahref="http://evuln.com/tools/xss-encoder/"><b>XSS String Encoder</b></a> - for generating XSS code to check your input validation filters against XSS.<br>
:small_orange_diamond: <ahref="https://gtfobins.github.io/"><b>GTFOBins</b></a> - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions.<br>
:small_orange_diamond: <ahref="https://guif.re/"><b>Guifre Ruiz Notes</b></a> - collection of security, system, network and pentest cheatsheets.<br>
:small_orange_diamond: <ahref="http://blog.safebuff.com/2016/07/03/SSRF-Tips/index.html"><b>SSRF Tips</b></a> - a collection of SSRF Tips.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/owasp-mstg"><b>MSTG</b></a> - The Mobile Security Testing Guide (MSTG) is a comprehensive manual for mobile app security testing.<br>
##### :black_small_square: Wordlists and Weak passwords
<p>
:small_orange_diamond: <ahref="https://weakpass.com/"><b>Weakpass</b></a> - for any kind of bruteforce find wordlists or unleash the power of them all at once!<br>
:small_orange_diamond: <ahref="https://hashes.org/"><b>Hashes.org</b></a> - is a free online hash resolving service incorporating many unparalleled techniques.<br>
:small_orange_diamond: <ahref="https://github.com/danielmiessler/SecLists"><b>SecLists</b></a> - collection of multiple types of lists used during security assessments, collected in one place.<br>
:small_orange_diamond: <ahref="https://github.com/berzerk0/Probable-Wordlists"><b>Probable-Wordlists</b></a> - sorted by probability originally created for password generation and testing.<br>
:small_orange_diamond: <ahref="https://bezpieka.org/polski-slownik-premium-polish-wordlist"><b>Polish PREMIUM Dictionary</b></a> - official dictionary created by the team on the forum bezpieka.org.<b>*</b><sup><ahref="https://sourceforge.net/projects/kali-linux/files/Wordlist/">1</sup><br>
:small_orange_diamond: <ahref="https://www.openbugbounty.org/"><b>Openbugbounty</b></a> - allows any security researcher reporting a vulnerability on any website.<br>
:small_orange_diamond: <ahref="https://www.hackerone.com/"><b>hackerone</b></a> - global hacker community to surface the most relevant security issues.<br>
:small_orange_diamond: <ahref="https://www.bugcrowd.com/"><b>bugcrowd</b></a> - crowdsourced cybersecurity for the enterprise.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/OWASP_Vulnerable_Web_Applications_Directory_Project"><b>OWASP-VWAD</b></a> - comprehensive and well maintained registry of all known vulnerable web applications.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/OWASP_Juice_Shop_Project"><b>OWASP Juice Shop Project</b></a> - the most bug-free vulnerable application in existence.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/Category:OWASP_WebGoat_Project"><b>OWASP WebGoat Project</b></a> - insecure web application maintained by OWASP designed to teach web app security.<br>
:small_orange_diamond: <ahref="https://github.com/opendns/Security_Ninjas_AppSec_Training"><b>Security Ninjas</b></a> - open source application security training program.<br>
:small_orange_diamond: <ahref="https://google-gruyere.appspot.com/"><b>Google Gruyere</b></a> - web application exploits and defenses.<br>
:small_orange_diamond: <ahref="https://github.com/amolnaik4/bodhi"><b>Bodhi</b></a> - is a playground focused on learning the exploitation of client-side web vulnerabilities.<br>
:small_orange_diamond: <ahref="https://websploit.h4cker.org/"><b>Websploit</b></a> - single vm lab with the purpose of combining several vulnerable appliations in one environment.<br>
:small_orange_diamond: <ahref="https://github.com/vulhub/vulhub"><b>vulhub</b></a> - pre-built Vulnerable Environments based on docker-compose<br>
:small_orange_diamond: <ahref="https://www.offensive-security.com/"><b>Offensive Security</b></a> - true performance-based penetration testing training for over a decade.<br>
:small_orange_diamond: <ahref="https://www.hackthebox.eu/"><b>Hack The Box</b></a> - online platform allowing you to test your penetration testing skills.<br>
:small_orange_diamond: <ahref="http://pwnable.kr/index.php"><b>pwnable.kr</b></a> - non-commercial wargame site which provides various pwn challenges regarding system exploitation.<br>
:small_orange_diamond: <ahref="https://pwnable.tw/"><b>Pwnable.tw</b></a> - is a wargame site for hackers to test and expand their binary exploiting skills.<br>
:small_orange_diamond: <ahref="https://picoctf.com/"><b>picoCTF</b></a> - is a free computer security game targeted at middle and high school students.<br>
:small_orange_diamond: <ahref="https://ctflearn.com/"><b>CTFlearn</b></a> - is an online platform built to help ethical hackers learn and practice their cybersecurity knowledge and skills.<br>
:small_orange_diamond: <ahref="https://practicalpentestlabs.com/"><b>Practical Pentest Labs</b></a> - pentest lab, take your Hacking skills to the next level.<br>
:small_orange_diamond: <ahref="https://www.root-me.org/?lang=en"><b>Root Me</b></a> - the fast, easy, and affordable way to train your hacking skills.<br>
:small_orange_diamond: <ahref="https://hackxor.net/"><b>hackxor</b></a> - is a realistic web application hacking game, designed to help players of all abilities develop their skills.<br>
:small_orange_diamond: <ahref="http://overthewire.org/wargames/"><b>OverTheWire</b></a> - can help you to learn and practice security concepts in the form of fun-filled games.<br>
:small_orange_diamond: <ahref="https://labs.wizard-security.net/"><b>Wizard Labs</b></a> - is an online Penetration Testing Lab.<br>
:small_orange_diamond: <ahref="https://pentesterlab.com/"><b>PentesterLab</b></a> - provides vulnerable systems that can be used to test and understand vulnerabilities.<br>
:small_orange_diamond: <ahref="https://ringzer0ctf.com/"><b>RingZer0</b></a> - tons of challenges designed to test and improve your hacking skills.<br>
:small_orange_diamond: <ahref="https://lab.pentestit.ru/"><b>Pentestit</b></a> - emulate IT infrastructures of real companies for legal pen testing and improving penetration testing skills.<br>
:small_orange_diamond: <ahref="https://microcorruption.com/login"><b>Microcorruption</b></a> - reversal challenges done in the web interface.<br>
:small_orange_diamond: <ahref="https://crackmes.one/"><b>Crackmes</b></a> - download crackmes to help improve your reverse engineering skills.<br>
:small_orange_diamond: <ahref="https://github.com/bugcrowd/bugcrowd_university"><b>Bugcrowd University</b></a> - open source education content for the researcher community.<br>
:small_orange_diamond: <ahref="https://github.com/rewardone/OSCPRepo"><b>OSCPRepo</b></a> - a list of resources and scripts that I have been gathering in preparation for the OSCP.<br>
:small_orange_diamond: <ahref="https://medium.com/@cxosmo/owasp-top-10-real-world-examples-part-1-a540c4ea2df5"><b>OWASP Top 10: Real-World Examples</b></a> - test your web apps with real-world examples (two-part series).<br>
:small_orange_diamond: <ahref="https://www.inoreader.com/"><b>Inoreader</b></a> - similar to feedly with a support for filtering what you fetch from rss.<br>
:small_orange_diamond: <ahref="https://thehackernews.com/"><b>The Hacker News</b></a> - leading news source dedicated to promoting awareness for security experts and hackers.<br>
:small_orange_diamond: <ahref="https://latesthackingnews.com/"><b>Latest Hacking News</b></a> - provides the latest hacking news, exploits and vulnerabilities for ethical hackers.<br>
:small_orange_diamond: <ahref="https://security.googleblog.com/"><b>Google Online Security Blog</b></a> - the latest news and insights from Google on security and safety on the Internet.<br>
:small_orange_diamond: <ahref="https://blog.qualys.com/"><b>Qualys Blog</b></a> - expert network security guidance and news.<br>
:small_orange_diamond: <ahref="https://www.darkreading.com/"><b>DARKReading</b></a> - connecting the Information Security Community.<br>
:small_orange_diamond: <ahref="https://twitter.com/disclosedh1"><b>publiclyDisclosed</b></a> - public disclosure watcher who keeps you up to date about the recently disclosed bugs.<br>
:small_orange_diamond: <ahref="https://www.reddit.com/r/hacking/"><b>Reddit - Hacking</b></a> - a subreddit dedicated to hacking and hackers.<br>
:small_orange_diamond: <ahref="https://sekurak.pl/"><b>Sekurak</b></a> - about security, penetration tests, vulnerabilities and many others (PL/EN).<br>
:small_orange_diamond: <ahref="https://nfsec.pl/"><b>nf.sec</b></a> - basic aspects and mechanisms of Linux operating system security (PL).<br>
:small_orange_diamond: <ahref="https://changelog.com/"><b>Changelog</b></a> - is a community of hackers; news & podcasts for developers and hackers.<br>
:small_orange_diamond: <ahref="https://calomel.org/unbound_dns.html"><b>Unbound DNS Tutorial</b></a> - a validating, recursive, and caching DNS server.<br>
:small_orange_diamond: <ahref="https://www.ctrl.blog/entry/knot-dns-resolver-tutorial.html"><b>Knot Resolver on Fedora</b></a> - how to get faster and more secure DNS resolution with Knot Resolver on Fedora.<br>
:small_orange_diamond: <ahref="https://www.aaflalo.me/2018/10/tutorial-setup-dns-over-https-server/"><b>DNS-over-HTTPS</b></a> - tutorial to setup your own DNS-over-HTTPS (DoH) server.<br>
:small_orange_diamond: <ahref="https://www.aaflalo.me/2019/03/dns-over-tls/"><b>DNS-over-TLS</b></a> - following to your DoH server, setup your DNS-over-TLS (DoT) server.<br>
:small_orange_diamond: <ahref="https://zwischenzugs.com/2018/01/26/how-and-why-i-run-my-own-dns-servers/"><b>DNS Servers</b></a> - how (and why) i run my own DNS Servers.<br>
:small_orange_diamond: <ahref="https://jamielinux.com/docs/openssl-certificate-authority/"><b>OpenSSL Certificate Authority</b></a> - build your own certificate authority (CA) using the OpenSSL command-line tools.<br>
:small_orange_diamond: <ahref="https://justinmeiners.github.io/lc3-vm/"><b>Write your Own Virtual Machine</b></a> - how to write your own virtual machine (VM).<br>
:small_orange_diamond: <ahref="https://github.com/cirosantilli/x86-bare-metal-examples"><b>x86 Bare Metal Examples</b></a> - dozens of minimal operating systems to learn x86 system programming.<br>
:small_orange_diamond: <ahref="https://github.com/djhworld/simple-computer"><b>simple-computer</b></a> - the scott CPU from "But How Do It Know?" by J. Clark Scott.<br>
