Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Step - Step is an open-source two-dimensional physics simulation engine (KDE).
SimPhy - Interactive 2D & 3D Physics simulation software
Khimera - Khimera is a chemical kinetics simulation software tool developed by Kintech Lab.
Physion - Physics Simulation Sandbox
Roblox - Reimagining the way people come together.