EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
GNU Solfege - GNU Solfege is free music education software.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Meludia - Listening exercises and to sharpen your ear and music theory skills
keezy - A colorful soundboard. Play with music.