Cubasis - Cubasis is Steinberg’s streamlined, multitouch sequencer for the iPad.
FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.
NanoStudio - NanoStudio is a recording studio for iOS, OS X and Windows.
Beat-J - Make beats and produce music tracks. Make your own cool tracks with BEAT J.