dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Tune Sweeper - Show duplicates in your Music library. Automatically select which duplicates to keep and delete based on your preferences. Remove duplicates with one-click from your iTunes or Music app library.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
TuneUp - TuneUp makes your music fresh and clean!
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
MPFreaker - Imagine a program that automatically fills in the missing information in your music library...