Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free game engine for development of desktop, mobile, and web games
A lightweight game server framework implemented with Actor Model
Doom-based AI research platform for reinforcement learning
Cross-platform 2D and 3D game engine with modular architecture
Multi Theft Auto is a game engine
Open source clone of the Age of Empires II engine
Multi-platform 2D and 3D game engine
FlightGear Flight Simulator: free open-source multiplatform flight sim
A planetarium software that shows a 3D simulation of the night sky
Maze creation, solving, exploration, and analysis
3D modeler, 3D game maker, 3D demo maker
A free 3D game engine to create games and realtimes scenes for Windows
3D C++ Game Engine - yet another open source game engine
2D Game Engine
2D Game Engine with Lua Scripting made on top of SFML
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
A lightweight, fast and extensible game server for Minecraft
3D-Accelerated open-source DOOM engine
scriptable game engine with built-in support for 2D graphics and sound