Algodoo is a physics-based 2D sandbox freeware from Algoryx Simulation AB as the successor to the popular physics application Phun. It was released on September 1, 2009 and is presented as: a learning tool, an open ended computer game, an animation tool, and an engineering tool.
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Algodoo is probably the best sandbox to ever do it. I've tried a few physics based sandboxes but none of them really encourage you to tinker to the length or breadth that Algodoo does, it's just fun to whip random stuff together in it. This and the online capabilities make this game a very fun game to just let your mind run free in