Phun - the 2D physics sandbox

Phun is a 2D physics simulator. That might not sound too exciting, but start playing around with it and expect to lose many hours of your life!

You can get an idea of its capabilities from the following video:

Phun is available for Windows and Linux and the author hopes to release a Mac version at some point. Even if you’re not really into physics, I’d at least give this a try. I bet you get hooked.