Chordbase Lite - Chordbase Lite is a paperless solution for the gigging musicians to display lyrics and chords on mobile devices.
Synthesia - A fun way to learn how to play the piano.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
SongBook - SongBook is a music app that helps you to manage your song collections complete with lyrics and chords.
Playground Sessions - Online piano learning game.