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
Step - Step is an open-source two-dimensional physics simulation engine (KDE).
Physion - Physics Simulation Sandbox
Khimera - Khimera is a chemical kinetics simulation software tool developed by Kintech Lab.
Roblox - Reimagining the way people come together.