Cross-platform 2D and 3D game engine with modular architecture
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The Ren'Py Visual Novel Engine
Cross-Platform C++ 2D/3D game engine
s&box is a modern game engine, built on Valve's Source 2
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform 2D and 3D game engine
3D engine with modern graphics
An OpenGL RTS game engine written in C
JavaScript-based game engine designed to empower developers
Stride (formerly Xenko), a free and open-source cross-platform C# game
UZDoom is a feature centric port for all Doom engine games
3D Game engine with editor
Injectable LUA scripting system, SDK generator, live property editor
An unofficial rules engine for the world's greatest card game
A completely free, open-source, 2D game engine
Free game engine for development of desktop, mobile, and web games
Multi Theft Auto is a game engine
Powerful, mature open-source cross-platform game engine for Python
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cross-platform, open source, and super fast MUD client with scripting
A modular Common Lisp game engine
Voxel game-creation platform with easy modding and game creation
Cross-platform 2D game engine focused on ultimate productivity
A re-implementation of Freelancer