Virtual MIDI Piano Keyboard - Virtual MIDI Piano Keyboard is a MIDI events generator and receiver.
Free Piano - FreePiano is a virtual MIDI keyboard and a VST host for windows.
FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
MidiKeys - MidiKeys is a small application for Mac OS X that presents a miniature MIDI keyboard onscreen.
EveryonePiano - Everyone Piano is the best free computer keyboard piano software, which supports downloading 3 types of music score formats like stave, right and left hand numbered musical notation and EOP file.
TiMidity++ - TiMidity++ is an open source MIDI to WAVE converter and player.