Some tools are unique or don't quite fit into one of the above catagories but are also quite useful.
FLAC File Stripper
Mirrors a directory tree of FLAC files, with the mirrored files containing only comment blocks (i.e. the audio data is stripped), thus substantially reducing the flac file size. This is useful if you need to submit sample files to Logitech for tagging-related debugging purposes. The file is a Perl script.
Windows (XP / 2000)
EF Duplicate MP3 Finder
Able to find duplicate audio files based on tags and by other criteria (such as filesize) across an entire collection.
+ Supports MP3, Ogg/Vorbis, WMA and FLAC- TrialWare