Predecessor of my other sandbox-like physics game
I was asked to upload this here, so I did. My apologies for the interface being EXTREMELY bad, I was young and bad at actionscript.

Restitution means how much things bounce. Density is their weight (0 is a static object). Friction is friction.

Joints:
Revolution Joint (K) = Motor joint, if you set enough motor speed and torque, the second object (the one under mouse on release) will start spinning.
Distance Joint (L) = Simple rigid joint between objects, is created between the point of click & release.
Gear Joint (H) = Will joint 2 objects to the background and make their rotations dependent on each other.
Prismatic Joint (G) = Jointed in the background, but allowing movement within a line (set (x,y) in variables)
Mouse Joint (J) = The joint you use in dragging.