Synthesia - A fun way to learn how to play the piano.
Mini Piano - Mini Piano is a fun on the go App which you can use right off the bat with its intuitive interface...
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
Piano Time - Piano Time is a multitouch piano with 36 visible keys and 4 selectable octaves.
Playground Sessions - Online piano learning game.
Linthesia - Linthesia is a game. A game of playing music! You only need a MIDI file