Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
The Ren'Py Visual Novel Engine
Cocos simplifies game creation and distribution with Cocos Creator
A complete 3-D game development suite written in Java
Real Time Strategy game engine supporting early Westwood classics
Xash3D FWGS 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
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Voxel game-creation platform with easy modding and game creation
Fast and lightweight JavaScript game engine built on WebGL and glTF
3D Game engine with editor
3D Procedural Game Engine Using OpenGL
LayaAir is an open-source 2D/3D engine
Powerful, mature open-source cross-platform game engine for Python
Solar2D Game Engine main repository (ex Corona SDK)
The ioquake3 community effort to continue supporting/developing id's
Cross-Platform C++ 2D/3D game engine
Magic Another Game Engine
A multi core friendly rigid body physics and collision detection lib
Recreation of the classic Grand Theft Auto III game executable
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Open-source engine for Heroes of Might and Magic III