Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
StepMania - Rhythm game for Windows, Mac, and Linux.
Frets on Fire - Bonus content.
Rhythm Heaven - Rhythm Heaven is an Addictive, Music, Rhythm, Puzzle and Single-player video game developed and published by Nintendo.
McOsu - A free open-source circle-clicking rhythm game practice client for osu!