Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Virtual MIDI Piano Keyboard - Virtual MIDI Piano Keyboard is a MIDI events generator and receiver.
Rakarrack - Rakarrack is a richly featured multi-effects processor emulating a guitar effects pedalboard.
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.
ToneLib GFX - The perfect custom tone with a complete guitar studio in your computer
Synthesia - A fun way to learn how to play the piano.