Glitch Sequencer is a free cellular automaton based MIDI sequencer for the PC and Mac. It offers an interesting style of composition based on evolving patterns and is great for fast, fluid experimentation. Glitch Sequencer was written by Bret Truchan in Processing using themidibus MIDI library.
New! Version 2.6 introduces a brand new feature called "Lenses". Lenses are an advanced feature that allows
sequenced changing of snapshot selection, tempo, clock division, and much more. See documentation for details.