Godot is a powerful cross-platform game engine
Multi Theft Auto is a game engine
Xash3D FWGS engine
The Ren'Py Visual Novel Engine
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Open source voxel game engine with support for survival and crafting
Voxel game-creation platform with easy modding and game creation
A game engine powered by python and panda3d
Open-source engine for Heroes of Might and Magic III
A complete 3-D game development suite written in Java
Fast and lightweight JavaScript game engine built on WebGL and glTF
Multi-platform 2D and 3D game engine
Descent 3 by Outrage Entertainment
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free game engine for development of desktop, mobile, and web games
Cocos simplifies game creation and distribution with Cocos Creator
A refreshingly simple data-driven game engine built in Rust
The HTML5 Creation Engine
dhewm 3 main repository
JavaScript-based game engine designed to empower developers
RPG Maker 2000/2003 and EasyRPG games interpreter
A modular Common Lisp game engine