Matriux
From Forensics Wiki
It is a fully featured security distribution consisting of a bunch of powerful, open source and free tools that can be used in Forensics investigations and much more.
About Matriux:
With Matriux, you can turn any system into a powerful penetration testing toolkit, without having to install any software into your hardisk. Matriux is designed to run from a Live environment like a CD / DVD or USB stick or it can easily be installed to your hard disk in a few steps. Matriux also includes a set of computer forensics and data recovery tools that can be used for forensic analysis and investigations and data retrieval.