Mixed in Key - Mixed In Key is award-winning DJ software that gives you the #1 technique of the world's best...
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.
Tunebat - A browser based song key and bpm database. Supplies compatible songs for harmonic mixing.
iTunes Duplicate Song Manager - iTunes Duplicate Song Manager with Folder Watch removes iTunes duplicates in Windows and Mac OS X.
KeyFinder - Key estimation software for DJs
SongGenie - SongGenie analyzes, identifies and repairs your mp3 tags and names.