SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Synthesia - A fun way to learn how to play the piano.
keezy - A colorful soundboard. Play with music.
Playground Sessions - Online piano learning game.
Splice - Music creation, collaboration, and sharing made simple.
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.