ZynAddSubFX - ZynAddSubFX is an open source software synthesizer for Linux, Mac OS X and Microsoft Windows.
Synthesia - A fun way to learn how to play the piano.
FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
WhySynth - WhySynth is a versatile softsynth which operates as a plugin for the
Playground Sessions - Online piano learning game.