Multi-platform 2D and 3D game engine
Cross-platform 2D and 3D game engine with modular architecture
Solar2D Game Engine main repository (ex Corona SDK)
Diablo build for modern operating systems
Descent 3 by Outrage Entertainment
Command & Conquer: Remastered Collection
Free game engine for development of desktop, mobile, and web games
Recreation of the classic Grand Theft Auto III game executable
Zero Hour running natively on macOS, iPhone & iPad
Powerful, mature open-source cross-platform game engine for Python
Voxel game-creation platform with easy modding and game creation
The game engine for everyone
3D Procedural Game Engine Using OpenGL
A free Chess program for Windows with a large set of features
Modified source engine (2017) developed by valve and leaked in 2020
A modern re-implementation of the classic DOS game Duke Nukem II
MIT Licensed Open Source version of Torque3D from GarageGames
Mini game engine for games104
Urho3D Game engine
A high speed C++17 Vulkan game engine
Cross-platform port of Arx Fatalis, a first-person role-playing game
3D C++ Game Engine - yet another open source game engine
Amazon Lumberyard is a free AAA game engine
A 2D game engine and level editor
KlayGE is a cross-platform open source game engine