Code for Cicero, an AI agent that plays the game of Diplomacy
Source code repository of the FreeOrion project
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Real-time collision detection and multi-physics simulation for VR
KlayGE is a cross-platform open source game engine
Retro Games in Gym
Several mods for Civilization IV: Colonization
evolution for vegastrike SpaceSim/Combat/Trade game
Develop an emulated Darkfall Online Server.
Tactical, turn-based game engine, that uses OpenGL and WinAPI
Open source, moddable game engine for the "Polygon Love 2" game