• Insecure.org – offers security news and other security resources
  • OWASP Top 10 - the top 10 web application security risks according to the Open Web Application Security Project (OWASP)
  • SecLists.org – archive of the most common security mailing lists


  • Kali Linux - a operating system focused on penetration testing and bundled with thousands of security tools
  • SecTools.org – the top 100 network security tools
  • Nmap.org – host of the Nmap security scanner and its documentation