dhewm 3 main repository
Xash3D FWGS engine
Real Time Strategy game engine supporting early Westwood classics
Godot is a powerful cross-platform game engine
The Ren'Py Visual Novel Engine
Multi Theft Auto is a game engine
Open source voxel game engine with support for survival and crafting
A game engine powered by python and panda3d
Fast and lightweight JavaScript game engine built on WebGL and glTF
Voxel game-creation platform with easy modding and game creation
The game engine for everyone
fheroes2 is a recreation of Heroes of Might and Magic II game engine
The HTML5 Creation Engine
Open-source engine for Heroes of Might and Magic III
A retro game engine for Python
The ioquake3 community effort to continue supporting/developing id's
Cross-Platform C++ 2D/3D game engine
Powerful, mature open-source cross-platform game engine for Python
Solar2D Game Engine main repository (ex Corona SDK)
Open source clone of the Age of Empires II engine
LayaAir is an open-source 2D/3D engine
Voxel game engine in C++ with OpenGL
A complete 3-D game development suite written in Java
Recreation of the classic Grand Theft Auto III game executable
The Tiny JavaScript Game Engine That Can!