FL Studio Mobile - Create & save multi-track music projects on a smartphone
AutoDrum - AutoDrum" is free, open source software for automatic drum performance.
Splice Beat Maker - Make and share beats in your browser
Band-in-a-Box - Band-in-a-Box is so easy to use!
Type Drummer - Drum by typing
GarageBand - GarageBand is a fully equipped music creation studio for Mac