Simply Piano - Fast and fun way to learn piano
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Yousician - Learn to play music at home, at your own pace
Synthesia - A fun way to learn how to play the piano.
La Touche Musicale - With La Touche Musicale, you can learn piano online easily with the songs you love. Discover a fun and effective learning method to progress very quickly.
Skoove - Babbel for learning the piano