Cross-Platform C++ 2D/3D game engine
Open source clone of the Age of Empires II engine
Voxel game engine in C++ with OpenGL
Solar2D Game Engine main repository (ex Corona SDK)
The game engine for everyone
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D Game engine with editor
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A multi core friendly rigid body physics and collision detection lib
Cross-platform 2D and 3D game engine with modular architecture
Cocos simplifies game creation and distribution with Cocos Creator
3D Procedural Game Engine Using OpenGL
Every creative journey starts with Unity Hub
Animation Compression Library
C++ lightweight cross-platform game engine
MIT Licensed Open Source version of Torque3D from GarageGames
Urho3D Game engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Vivid is a modern C++ 3D engine using OpenGL4+
DOOM / Heretic / Hexen source port with enhanced graphics and UI
A cross platform Lua based game engine
A 2D game engine and level editor
Free and Open Game Programming Language for Windows and GNU/Linux
scriptable game engine with built-in support for 2D graphics and sound
2D game engine for traditional platform games