Audulus - A universe of sound at your fingertips - Audulus is a modular music processing app
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Blocs Wave - A free audio app for creating music loops.
Splice - Music creation, collaboration, and sharing made simple.
FL Studio Mobile - Create & save multi-track music projects on a smartphone
n-Track Studio - Audio recording and music creation app for iOS.