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 * [Penetration Testing Framework (PTF)](http://www.vulnerabilityassessment.co.uk/Penetration%20Test.html) - Outline for performing penetration tests compiled as a general framework usable by vulnerability analysts and penetration testers alike.
 * [XSS-Payloads](http://www.xss-payloads.com) - Ultimate resource for all things cross-site including payloads, tools, games and documentation.
 * [Open Source Security Testing Methodology Manual (OSSTMM)](http://www.isecom.org/mirror/OSSTMM.3.pdf) - Framework for providing test cases that result in verified facts on which to base decisions that impact an organization's security.
+* [MITRE's Adversarial Tactics, Techniques & Common Knowledge (ATT&CK)](https://attack.mitre.org/) - Curated knowledge base and model for cyber adversary behavior.
 
 ### Exploit Development
 * [Shellcode Tutorial](http://www.vividmachines.com/shellcode/shellcode.html) - Tutorial on how to write shellcode.