Meludia - Listening exercises and to sharpen your ear and music theory skills
AthTek DigiBand - AthTek DigiBand is a piece of automatic music composition software for Windows.
GNU Solfege - GNU Solfege is free music education software.
Automated Composing System - ACS creates automated arrangements so you can compose music without musical knowledge.
Perfect Ear - A simple yet advanced application for improving your solfege skills.
TrebleMaker - Procedurally generated, royalty-free MIDI compositions