The Sleuth Kit and Autopsy Browser. Both are open source digital investigation tools (a.k.a. digital forensic tools) that run on Unix systems (such as Linux, OS X, FreeBSD, OpenBSD, and Solaris). They can be used to analyze NTFS, FAT, Ext2, Ext3, UFS1, and UFS2 file systems and several volume system types.
Are you sick of audio players that think they know how to organize your music for you? Do other media libraries choke and die after a mere 10,000 songs? Do you often find yourself thinking Boy, I wish I could just grep my music? Or are you just looking for something that can tag your audio files?
PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from Hard Disks and CDRom and lost pictures (thus, its 'Photo Recovery' name) from digital camera memory. PhotoRec ignores the filesystem and goes after the underlying data, so it will still work even if your media's filesystem has been severely damaged or re-formatted.