VisualBots is an Excell-based program to simulate boids, fractals all kind off things. Easy to program yourself.
Sodaconstructor is a construction kit for interactive creations using masses and springs. By altering physical properties like gravity, friction, and speed, curiously anthropomorphic models can be made to walk, climb, wriggle, jiggle, or collapse int
Great to learn about building constructions for bridges. XP and OSX. Kids love it.