FL Studio Mobile - Create & save multi-track music projects on a smartphone
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Splice Beat Maker - Make and share beats in your browser
keezy - A colorful soundboard. Play with music.
Sampulator - Make (and record) beats on your keyboard
G-Stomper Studio - G-Stomper Studio is a feature-packed, mobile music production tool.