Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Sampulator - Make (and record) beats on your keyboard
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
keezy - A colorful soundboard. Play with music.
Ramsophone - A generative art/music machine. (Be sure to refresh!)