GarageBand - GarageBand is a fully equipped music creation studio for Mac
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
RapScript - RapScript is the fastest-growing word-machine that is specially designed for freestyle rappers.
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
The Art of Rap - The Art of Rap is a free to use mobile application that allows you to create and record your rap movies to share it with others.
FL Studio Mobile - Create & save multi-track music projects on a smartphone