OWASP

OWASP is a worldwide not-for-profit charitable organization that focuses on improving the security of software.

It's a community of like-minded professionals who release software and knowledge-based documentation on application security, covering such subjects as:

• Information gathering
• Configuration and deployment management testing
• Identity management testing
• Authentication testing
• Authorization testing
• Session management testing
• Input validation testing
• Error handling
• Cryptography
• Business logic testing
• Client-side testing