Voxel game engine in C++ with OpenGL
Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
The Ren'Py Visual Novel Engine
Xash3D FWGS engine
A game engine powered by python and panda3d
Voxel game-creation platform with easy modding and game creation
Open source voxel game engine with support for survival and crafting
The game engine for everyone
Real Time Strategy game engine supporting early Westwood classics
A complete 3-D game development suite written in Java
Cocos simplifies game creation and distribution with Cocos Creator
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Recreation of the classic Grand Theft Auto III game executable
Solar2D Game Engine main repository (ex Corona SDK)
Cross-Platform C++ 2D/3D game engine
Open source clone of the Age of Empires II engine
The ioquake3 community effort to continue supporting/developing id's
dhewm 3 main repository
Open-source engine for Heroes of Might and Magic III
Powerful, mature open-source cross-platform game engine for Python
Descent 3 by Outrage Entertainment
Magic Another Game Engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D