RecordGram - A studio and production marketplace in the palm of your hand
SoundBetter - Marketplace for musicians and music production professionals
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Soundsnap - Shutterstock for sound effects
Gemtracks - Buy instrumental backing tracks and beats for $149! Get master ownership and copyright transferred to you once purchased.
HEXelon MAX - HEXelon MAX is a science calculator. It solves math expressions like: Sin(Pi)-Root(-8;3)+3.