Pianu - Learn to play the piano in your browser.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Flowkey - The easiest way to learn piano with your iPhone or iPad
ToneLib GFX - The perfect custom tone with a complete guitar studio in your computer
Playground Sessions - Online piano learning game.
Rakarrack - Rakarrack is a richly featured multi-effects processor emulating a guitar effects pedalboard.