Started playing with Phys2d recently while researching 2D physics engines. As every man and his dog seems to be copying Crayon Physics at the moment, I thought I might as well go ahead and do the same.
Just draw with the mouse and the objects will drop into the scene. I've not added any checks for complex polygons, so try not to draw any shapes which intersect themselves as they tend to freak out a bit. Press R to reset the scene.