Flowkey - The easiest way to learn piano with your iPhone or iPad
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.
Skoove - Babbel for learning the piano
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.