Magic Pen!

Algodoo, previously Phun, is an educational, entertaining and somewhat addictive piece of software for playing around in a 2D physics sandbox in a cartoon-y fashion. Algodoo is not just another game, but is intended to bring in interactive physics as an enabling technology for entirely new concepts and usage patterns in creative computing for animation, simulation, narrative-y, engineering, art and education.

Crayon Physics Deluxe is a 2D physics puzzle / sandbox game, in which you get to experience what it would be like if your drawings would be magically transformed into real physical objects. Solve puzzles with your artistic vision and creative use of physics.