XSS Filter Evasion Cheat Sheet - OWASP : This article is focused on providing application security testing professionals with a guide to assist in Cross Site Scripting testing.
Kali Linux : Penetration Testing Linux OS containing tools to test the security of system or a network.
Inj3ct0r 1337day.com : Exploit database separated by exploit type (local, remote, DoS, Poc, etc.)
API Security Checklist : Checklist of the most important security countermeasures when designing, testing, and releasing your API.
domsnitch : A passive reconnaissance tool inside the DOM (experimental)
The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.