YuMe - A multi-screen video advertising company providing digital video brand advertising solutions.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Theremin - Multitouch synth instrument that makes an array of sounds
GNU Solfege - GNU Solfege is free music education software.
Google Music Lab - Interactive experiments that use the Web Audio API
Meludia - Listening exercises and to sharpen your ear and music theory skills