Ocean beta - Make music with friends in your browser
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
iO-808 - Rhythm composer modeled after Roland's TR-808 drum machine.
Meludia - Listening exercises and to sharpen your ear and music theory skills
RTRO Camera by Moment - Shoot vintage video stories, share vibey stories.
LenMus - LenMus is a free program for learning music.