there is a free one out there... www.VVVV.org
its not like the others tho, it woud probly equate to Max MSP for Video. and IMo is alot better and easier to get to know than Jitter. I've just started to get into it and this was one of my first compositions...
http://www.youtube.com/watch?v=jixh2TPc7T4
sorry about the dreadful youtube quality.. and the white at the beginning bleaches out alot of the dots
its all done in VVVV (pronouced 4V) using directx for 3d stuff. there is a bit of a learning curve, but the idea of synthesizing video from scratch ahs always intruiged me.. check it out anyway... there is literally no limits with it.