Mixed in Key - Mixed In Key is award-winning DJ software that gives you the #1 technique of the world's best...
TuneUp - TuneUp makes your music fresh and clean!
Tunebat - A browser based song key and bpm database. Supplies compatible songs for harmonic mixing.
MusicBrainz Picard - Official website for MusicBrainz Picard, a cross-platform music tagger written in Python.Downloads · MusicBrainz Blog · Picard 2.
KeyFinder - Key estimation software for DJs
SongKong - SongKong fixes your music simply and easily