21 best free security tools

Check out these free, standout software tools that will make your daily security work easier, whether it's pen-testing, OSINT, vulnerability assessment, and more.

As an infosec professional, you may be already familiar with decades-old network monitoring and security tools like Nmap, Wireshark or Snort, and password crackers like Ophcrack. Having these applications at your disposal has been an indispensable part of the gig.

What are some other free tools and services you can benefit from? The following list of nearly two dozen tools and services include everything from password crackers to software decompilers to vulnerability management systems and networks analyzers. Whatever your security role is, you'll find something useful in this list.

Here, in no particular, order are the 21 best free security tools:

  1. Maltego
  2. OWASP Zed Attack Proxy (ZAP)
  3. Shodan
  4. Kali Linux
  5. DNS Dumpster
  6. Photon
  7. Hybrid Analysis
  8. Nessus
  9. ANY.RUN
  10. Tor Browser
  11. Darksearch.io
  12. John the Ripper
  13. OWASP Dependency-Check
  14. Microsoft Visual Studio
  15. Java Decompiler
  16. ModSecurity
  17. Burp Suite
  18. Metasploit
  19. Aircrack-ng
  20. Intelligence X
  21. GrayhatWarfare


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