Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
The Ren'Py Visual Novel Engine
The game engine for everyone
A game engine powered by python and panda3d
Open-source engine for Heroes of Might and Magic III
A retro game engine for Python
A complete 3-D game development suite written in Java
Real Time Strategy game engine supporting early Westwood classics
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Voxel game-creation platform with easy modding and game creation
Solar2D Game Engine main repository (ex Corona SDK)
Voxel game engine in C++ with OpenGL
Open source clone of the Age of Empires II engine
The flexible game engine
Powerful, mature open-source cross-platform game engine for Python
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
RPG Maker 2000/2003 and EasyRPG games interpreter
3D game engine/framework in C, with Luajit and Python bindings now
dhewm 3 main repository
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
A modular Common Lisp game engine