Meludia - Listening exercises and to sharpen your ear and music theory skills
keezy - A colorful soundboard. Play with music.
GNU Solfege - GNU Solfege is free music education software.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Auricula - Practice your sense of hearing and learn to identify intervals for your musical development.
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.