* A tool to scrape LinkedIn: https://github.com/dchrastil/TTSL
* cree.py http://ilektrojohn.github.com/creepy/
### Whois
WHOIS information is based upon a tree hierarchy. ICANN (IANA) is the authoritative registry for all of the TLDs and is a great starting point for all manual WHOIS queries.
### Other Great Intelligence Gathering Sources and Tools
* Resources from Pentest-standard.org - http://www.pentest-standard.org/index.php/PTES_Technical_Guidelines#Intelligence_Gathering
## Active Recon
* Tons of references to scanners and vulnerability management software for active reconnaissance - http://www.pentest-standard.org/index.php/PTES_Technical_Guidelines#Vulnerability_Analysis