Physion - Physics Simulation Sandbox
Algodoo - Algodoo is a 2D simulator freeware product designed as a physics learning tool. It was originally created by Emil Emerfeldt as part of his master’s thesis in 2008. Read more about Algodoo.
SimPhy - Interactive 2D & 3D Physics simulation software
Mutilate-a-Doll 2 - Virtual stressball physics sandbox about mutilating ragdolls in various ways using an overwhelming amount of items.
Roblox - Reimagining the way people come together.
Magic Pen - Robots vs Magic has always been cool.