Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Injectable LUA scripting system, SDK generator, live property editor
Open source voxel game engine with support for survival and crafting
Fast and lightweight JavaScript game engine built on WebGL and glTF
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
Voxel game-creation platform with easy modding and game creation
A complete 3-D game development suite written in Java
A game engine powered by python and panda3d
Free game engine for development of desktop, mobile, and web games
LayaAir is an open-source 2D/3D engine
Game framework with AI
RPG Maker 2000/2003 and EasyRPG games interpreter
Multi Theft Auto is a game engine
fheroes2 is a recreation of Heroes of Might and Magic II game engine
An easy to use 2D HTML5 game engine written in TypeScript
The Ren'Py Visual Novel Engine
Open source clone of the Age of Empires II engine
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The HTML5 Creation Engine
A modular Common Lisp game engine
3D Game engine with editor
A Flutter based game engine