The Sleuth Kit (TSK) is a library and collection of command line tools that allow you to investigate volume and file system data. The library can be incorporated into larger digital forensics tools and the command line tools can be directly used to find evidence.
The Sleuth Kit
The Autopsy Forensic Browser is a graphical interface to the command line digital investigation tools in The Sleuth Kit. Together, they allow you to investigate the file system and volumes of a computer.
Autopsy Forensic Browser