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
Crayon Physics Deluxe - Crayon Physics Deluxe
Physion - Physics Simulation Sandbox
Roblox - Reimagining the way people come together.
FisicaLab - FisicaLab (can be pronounced as PhysicsLab) is an educational application to solve physics problems.