Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
The Ren'Py Visual Novel Engine
A game engine powered by python and panda3d
A complete 3-D game development suite written in Java
Xash3D FWGS engine
The game engine for everyone
Open source voxel game engine with support for survival and crafting
Voxel game-creation platform with easy modding and game creation
Real Time Strategy game engine supporting early Westwood classics
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Cocos simplifies game creation and distribution with Cocos Creator
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)
The ioquake3 community effort to continue supporting/developing id's
Powerful, mature open-source cross-platform game engine for Python
dhewm 3 main repository
Cross-Platform C++ 2D/3D game engine
Open-source engine for Heroes of Might and Magic III
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Descent 3 by Outrage Entertainment
LayaAir is an open-source 2D/3D engine
A game framework written with osu! in mind.
Magic Another Game Engine