Hiya,
I've just released a public beta version of my realtime cloth solver for MotionBuilder.
You can have a quick peek of it in action here:
http://www.brekel.com
You'll also find some more details and find out how to get (free) access to it if you want to be a beta tester.
Cheers,
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Jasper Brekelmans
Senior Character/Mocap TD
j@brekel.com
http://www.brekel.com