Hydrogen - Hydrogen is an advanced drum machine.
Cubasis - Cubasis is Steinberg’s streamlined, multitouch sequencer for the iPad.
drumbit - A very easy to use drum machine.
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.
HTML5 Drum Machine - The HTML 5 Drum Machine is a browser-based drum machine inspired by the classic Roland TR-808.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).