Elysium by LucidMac Software
There are not many of us out there who are still looking for strictly a midi generator out of our music software, but there are some in the sea still. If you are looking for something a little bit more interesting from your midi sequencer then you may want to consider Elysium by LucidMac Software. Elysium is a generative midi sequencer that utilizes a unique honey comb type grid to build upon its sequences. It is strictly midi, but the creator states that you can render all the sequences out to another workstation such as Ableton Live or elsewhere.
"Elysium is generative which relates to the way the music is created by building up a “system” composed of layers, cells, tokens, and playheads that combined, when “played”, to produce a sequence of notes."
It is available as a free download, but is Mac OS X 10.5+ only. Give it a download and let us know what you think.