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Offensive Security's penetration testing Linux distribution.

Kali Linux, formerly BackTrack Linux, is a Linux distribution made for the purpose of penetration testing. The tag-line of the software is "The quieter you become, the more you are able to hear".

The distribution contains a great many security tools like the Metasploit pentesting framework, port scanners, traffic analysis tools, and password crackers.

It is bootable from a CD, DVD or USB storage.

Official site:
Official site of BackTrack (no longer maintained):