OE-CAKE! is described as 'OE-Cake, OE-CAKE! or OE Cake is a 2D fluid physics sandbox which was used to demonstrate the Octave Engine fluid physics simulator created by Prometech Software Inc' and is a Sandbox Game in the Games category. There are four games similar to OE-CAKE! for Mac, Windows, Linux, iPad and Online / Web-based. The best alternative is Algodoo. It's not free, so if you're looking for a free alternative, you could try Magic Pen or SimPhy.
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.
Robots vs Magic has always been cool. Play as the awesome droids and take down that pesky wizard in this side defense game. Build and upgrade your army by collecting strategically placed crystals, but don't let the enemy get their hands on them!
Simphy is a simulation software to create 2D and 3D simulations with easy drag and drop options. You can create different types of bodies inside its physics world with different parameters like restitution, friction, velocity etc.