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.

Roblox - Reimagining the way people come together.

Mutilate-a-Doll 2 - Virtual stressball physics sandbox about mutilating ragdolls in various ways using an overwhelming amount of items.

Lunacraft - Lunacraft focuses on Endless Creativity and Exploration elements.

SimPhy - Interactive 2D & 3D Physics simulation software

Blockland - Blockland is a non-competitive multiplayer sandbox-style construction game. It's kind of like playing with legos on the internet.