Years in the making, this fully-featured iOS synth not only sounds amazing, it's completely free and open source. This could be the start of something huge.
ORAC is such an incrediblly useful and diverse solution for open-source music machines like Critter & Guitari's Organelle, it's difficult to describe what it is. This video does the job though!
Want to save your small business a small fortune? Check out these 5 open source (and sometimes free) apps/projects that cover all the bases for small businesses, entrepreneurs and home-users alike.