21 best free security tools

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

Maltego