Synthesia - A fun way to learn how to play the piano.
Loopy Pro - Loopy, the sophisticated, tactile live looper app that reinvents iPhone and iPad music making.
Playground Sessions - Online piano learning game.
Group the Loop - Live Looping with usefull GUI, Verse/Chorus layer system, drummer, effects, etc...
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
Repetito - Repetito: the multichannel looper software for live performance on the PC.