GeoSonix
GeoSonix is a free open source graphical music composition environment.
Download link is unavailable since the product is discontinued.
GeoSonix is a free open source graphical music composition environment. With it you create 2D or 3D "scores" that GeoSonix "plays" sending MIDI (or OSC) messages to synths of your choice.
GeoSonix works smoothly with a vast range of available MIDI synths and composition environments. It includes many MIDI based example scores and score-generating scripts.
Download link is unavailable since the product is discontinued.