Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
The flexible game engine
Multi Theft Auto is a game engine
Open source voxel game engine with support for survival and crafting
The game engine for everyone
A game engine powered by python and panda3d
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
Voxel game-creation platform with easy modding and game creation
A Flutter based game engine
The Ren'Py Visual Novel Engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cocos simplifies game creation and distribution with Cocos Creator
A modular Common Lisp game engine
A game framework written with osu! in mind.
Recreation of the classic Grand Theft Auto III game executable
Xash3D FWGS engine
Magic Another Game Engine
Descent 3 by Outrage Entertainment
Open source clone of the Age of Empires II engine
dhewm 3 main repository
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
A retro game engine for Python