VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...
Virtual MIDI Piano Keyboard - Virtual MIDI Piano Keyboard is a MIDI events generator and receiver.
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.
Free Piano - FreePiano is a virtual MIDI keyboard and a VST host for windows.
Virtual Piano - Free Online Piano App
TiMidity++ - TiMidity++ is an open source MIDI to WAVE converter and player.