"Everybody who has been through the dilemma after a traffic accident knows what this is about. Besides having all this trouble and the dents in your car there are many hidden challenges that are coming up on the victim of the accident. Insurance companies, car repair shop, lawyers and courts demand documents, experts reports, bills and receipts, photos and in most cases a sketch of the sequence of events that led to the accident. "

JBox2D is a close Java port of Erin Catto's excellent C++ Box2D physics engine. Check out the demos below to see some examples of what it can do.

Celestia, a real-time 3D space simulation featuring a database of over 100,000 stars, nearly a hundred solar system, objects, and a complete catalog of extrasolar planets.

Click on one of the physics simulations below... you'll see them animating in real time, and be able to interact with them by dragging objects or changing parameters like gravity.