MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
FL Studio Mobile - Create & save multi-track music projects on a smartphone
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Splice Beat Maker - Make and share beats in your browser
Plane9 - Plane9 is a revolutionary 3d visualizer where you never have to settle for just one view ever again.
Type Drummer - Drum by typing