FL Studio Mobile - Create & save multi-track music projects on a smartphone
RapScript - RapScript is the fastest-growing word-machine that is specially designed for freestyle rappers.
Splice Beat Maker - Make and share beats in your browser
AR Lyrics - Lyrics in the air!
Sampulator - Make (and record) beats on your keyboard
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.