Keezy Drummer - Make a beat in seconds
Sampulator - Make (and record) beats on your keyboard
BlokDust - Join blocks together to build sounds with this web-based music making app.
Melodics Drums - Level up your drumming skills
Audulus - A universe of sound at your fingertips - Audulus is a modular music processing app
Touch Pianist - Play piano like a pro without playing piano.