The game engine for everyone
Voxel game engine in C++ with OpenGL
Cross-platform 2D and 3D game engine with modular architecture
dhewm 3 main repository
Free game engine for development of desktop, mobile, and web games
Open source clone of the Age of Empires II engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D Game engine with editor
GemRB is a portable open-source implementation of the Infinity Engine
Injectable LUA scripting system, SDK generator, live property editor
An isometric arcade-style game of skill, puzzles and exploration
Urho3D Game engine
Vivid is a modern C++ 3D engine using OpenGL4+
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Amazon Lumberyard is a free AAA game engine
3D C++ Game Engine - yet another open source game engine
2D Game Engine
2D Game Engine with Lua Scripting made on top of SFML