Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.
Mixed in Key - Mixed In Key is award-winning DJ software that gives you the #1 technique of the world's best...
Spek - Spek helps to analyse your audio files by showing their spectrogram.
KeyFinder - Key estimation software for DJs
REW - REW is free room acoustics analysis software for measuring and analysing room and loudspeaker...
Tunebat - A browser based song key and bpm database. Supplies compatible songs for harmonic mixing.