Godot is a powerful cross-platform game engine
The HTML5 Creation Engine
3D game engine/framework in C, with Luajit and Python bindings now
Ct.js is a desktop game engine that makes learning programming fun
Xash3D FWGS engine
Real Time Strategy game engine supporting early Westwood classics
The game engine for everyone
Multi Theft Auto is a game engine
A modular Common Lisp game engine
A complete 3-D game development suite written in Java
Solar2D Game Engine main repository (ex Corona SDK)
Cross-platform 2D and 3D game engine with modular architecture
Fast and lightweight JavaScript game engine built on WebGL and glTF
A retro game engine for Python
Open source library for creative expression on the web, desktop, etc.
A game engine powered by python and panda3d
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
JavaScript-based game engine designed to empower developers
Multi-platform 2D and 3D game engine
A game framework written with osu! in mind.
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A refreshingly simple data-driven game engine built in Rust
Stride (formerly Xenko), a free and open-source cross-platform C# game
Free game engine for development of desktop, mobile, and web games
Descent 3 by Outrage Entertainment