Hedgehog Sequencer:
http://www.crudites.org/soundventures/s … ehog/#beta

(There is also Tractor Pull and another program made by the same people that made hedgehog, i just couldn't find the links)

Shifty Death Synthesizer:
http://www.gweep.net/~shifty/death/

Bhaji's Loops / Microbe:
http://chocopoolp.com/

Anyone else know of any neat tools?
EDIT: I just wanted to give some alternatives to some people, a little variation, and figured i'd share some of the findings of the research i've been doing lately.