SeeMusic
Synthesia
Linthesia
Piano From Above
Midiano.com
Symphonium
Musicope
Neothesia
PianoBooster
Flowkey
Melodics
Real Piano Teacher
Piano Lessons
Simply Piano
HDpiano
Synthesia
Synthesia - A fun way to learn how to play the piano.
Flowkey - The easiest way to learn piano with your iPhone or iPad
Linthesia - Linthesia is a game. A game of playing music! You only need a MIDI file
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
Real Piano Teacher - Real Piano Teacher is a music learning application that lets you learn how to play the piano, organ, flute, Guitar, and many other instruments just in seven days.