Welcome to the Collide Project! The Collide Project is freeware that lets you design your own 2D pseudo-physics screen savers.
First, you design your objects and give them a certain weight. Then you place you objects in the world simulator, and watch them
spin, gravitate towards (or away from) each other, and collide into each other! Save the worlds you like best to be used as your screen saver.
Build the objects.
Put the objects in their world.
Watch them interract!
(Sample "world files" are included with the ScreenSaver.)