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