Injectable LUA scripting system, SDK generator, live property editor
Powerful, mature open-source cross-platform game engine for Python
Cross-Platform C++ 2D/3D game engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Voxel game engine in C++ with OpenGL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Solar2D Game Engine main repository (ex Corona SDK)
Open-source engine for Heroes of Might and Magic III
Open source clone of the Age of Empires II engine
The game engine for everyone
3D Procedural Game Engine Using OpenGL
Cross-platform 2D and 3D game engine with modular architecture
RPG Maker 2000/2003 and EasyRPG games interpreter
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
dhewm 3 main repository
3D Game engine with editor
Animation Compression Library
A multi core friendly rigid body physics and collision detection lib
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
An isometric arcade-style game of skill, puzzles and exploration
ZDoom 2.8.1 fork focusing on modernisation, performance and stability