Flax Engine, multi-platform 3D game engine
Cross-platform 2D and 3D game engine with modular architecture
A game engine with an emphasis on real-time cutting-edge solutions
GZDoom is a feature centric port for all Doom engine games
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Descent 3 by Outrage Entertainment
Diablo build for modern operating systems
Recreation of the classic Grand Theft Auto III game executable
Free game engine for development of desktop, mobile, and web games
Complete Open Source and Modular solution for MMO
Doom-based AI research platform for reinforcement learning
Open source FPS/RTS Game
A free 3D game engine to create games and realtimes scenes for Windows
MIT Licensed Open Source version of Torque3D from GarageGames
Mini game engine for games104
Cross-platform port of Arx Fatalis, a first-person role-playing game
Amazon Lumberyard is a free AAA 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++.
Legandary Story of the Zarakite
Compatible client of Ace of Spades 0.75