Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
keezy - A colorful soundboard. Play with music.
StepMania - Rhythm game for Windows, Mac, and Linux.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.