Mixed in Key - Mixed In Key is award-winning DJ software that gives you the #1 technique of the world's best...
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
KeyFinder - Key estimation software for DJs
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Tunebat - A browser based song key and bpm database. Supplies compatible songs for harmonic mixing.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.