The Autopsy Forensic Browser is a graphical interface to the command line
digital investigation analysis tools in The Sleuth Kit.  Together, they can
analyze Windows and UNIX disks and file systems (NTFS, FAT, UFS1/2, Ext2/3).

The Sleuth Kit and Autopsy are both Open Source and run on UNIX platforms.
As Autopsy is HTML-based, you can connect to the Autopsy server from any
platform using an HTML browser.  Autopsy provides a "File Manager"-like
interface and shows details about deleted data and file system structures.

WWW: http://www.sleuthkit.org/autopsy/