Try Backtrack 4 and Knoppix-STD. Both are good to perform forensic analysis of computer systems.
You can get lots of information from CMU-SEI which is the First Responders Forensics Guide, and you can also get literature from the internet. WinHex is a program that does forensic analysis in Windows.
The web page by Gary Kessler http://www.garykessler.net/library/forensicsurl.html gives excellent forensics information.
Visit http://www.digital-forensic.org to download the toolkit for Fedora or Ubuntu. You can also get the source code. This toolkit relies on python.