Penetration Testing

OWASP - Open Web Application Security Project
OWASP Top 10 - The top 10 most critical web application security risks
OWASP Cheat Sheet Series - Collection of cheat sheets for secure coding practices
Penetration Testing Execution Standard (PTES) - A standard for penetration testing
NIST SP 800-115 - Technical Guide to Information Security Testing and Assessment
Penetration Testing Framework - A framework for penetration testing
Penetration Testing Methodologies - A comprehensive guide to penetration testing methodologies

Burp Suite - Web application security testing tool
OWASP ZAP - Open source web application security scanner
Metasploit - Penetration testing framework
Nmap - Network discovery and security auditing tool
Wireshark - Network protocol analyzer
Nikto - Web server scanner
SQLMap - Automated SQL injection and database takeover tool
Aircrack-ng - Suite of tools for assessing WiFi network security
Python tool for pen tetsting
Kali Linux - Debian-based Linux distribution for penetration testing and security auditing