Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Age of Empires (series) - The Eso.com url/domain is going away on 7/23/2018. After that time, you'll need to access this site via agecommunity.com. Please update your bookmarks!
SimPhy - Interactive 2D & 3D Physics simulation software
Physion - Physics Simulation Sandbox
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Roblox - Reimagining the way people come together.