Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
Swatches - A fun and accurate color picker for the real world
StepMania - Rhythm game for Windows, Mac, and Linux.
ColorSnapper - The missing color picker for Mac.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Colordot for iOS - A color picker for humans.