animated? linkage geometry

I want to study the geometry of some simple linkages; pushrods, bell cranks, and levers. Specifically, I want to graphically watch the action in motion.
All in 2D.
Is there an affordable program available to do this?
thanks,
Judy
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HiHo; Go to www.mcneel.com and download "rhino" and "bongo". both are free for evaluation. Easy to learn and use.

cranks,
motion.
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