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Cythar Sequencer
Here's a pretty neat open source software sequencer I've been playing with lately. It's pretty great for live improv stuff, really fun to use with a touchscreen. It's got a pretty unique user interface - it's based around the idea of "strings", like on a guitar...
The same developer has also made a simpler (but non-free) VST sequencer around a similar concept - http://b-step.monoplugs.com/