Volatility!

The Autopsy Forensic Browser is a graphical interface to the digital investigation tools in The Sleuth Kit. Together, they allow you to investigate the file system and volumes of a computer.

The Rekall Framework is a completely open collection of tools, implemented in Python under the Apache and GNU General Public License, for the extraction and analysis of digital artifacts computer systems.

CAINE Computer Aided INvestigative Environment Live CD/DVD, computer forensics, digital forensics