Phun - Physics Engine
I've spent the whole day using this, and I'll probably spend the evening at it too. Phun is a 2D "physics sandbox," created by Swedish Computer Scientist, Emil Ernerfeldt, for his Masters thesis. The idea was to design a fun interactive tool that allowed children (of all ages) to learn more about physics by direct manipulation.
Physics sandboxes aren't all that unique but this one is certainly worth investigating. Basically, you just draw what you want and hey presto, theres your 2d object, already interacting with the world. Just look at the video, it goes through most of what you can do with it. It's available for Mac, Windows, and Linux.
Get it at [www.phun.at] and prepare to waste your life :)
Posted at 17:28