Sodaconstructor: Interactive creations using masses and springs (2007)
sodaplay.com
sodaplay.com
For example, it let you write text: http://sodaplay.com/creators/russellsprouts/items/font
Some good creators, I'm sure there are many more I'm forgetting:
http://sodaplay.com/creators/mmaarrkkuuss
http://sodaplay.com/creators/edlinfan
http://sodaplay.com/creators/grape
http://sodaplay.com/creators/jeckyll
http://sodaplay.com/creators/im_an_alien
http://sodaplay.com/creators/phider
http://sodaplay.com/creators/lectvay
Many models are made up of motors with legs attached. Here are some interesting ones:
http://sodaplay.com/creators/motors
http://sodaplay.com/creators/other_motors
Also of interest, this paper empirically discovers the physics behind it: http://falcoprof.altervista.org/dispense/sodamathspaperfull....