There are many alternatives to Crayon Physics Deluxe for Mac if you are looking for a replacement. The best Mac alternative is The Powder Toy, which is both free and Open Source. If that doesn't suit you, our users have ranked nine alternatives to Crayon Physics Deluxe and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Crayon Physics Deluxe are Algodoo and iPhysics Sandbox.
The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox game, it simulates air pressure and velocity as well as heat!.
Algodoo gives you the opportunity to play with physics. Use your own hands and simple drawing tools to design, construct and explore the world of physics.
iPhysics Sandbox is a simplistic physics sandbox (go figure). Depending on your personal setting configuration, its possible to get iPhysics engine to calculate every little attribute of every little object.
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I think its super fun and you can do whatever you want!