A modular Common Lisp game engine
Free, cross-platform 2D game engine powered by Haxe and OpenFL
A completely free, open-source, 2D game engine
A retro game engine for Python
Python MUD/MUX/MUSH/MU* development system
Go bindings for raylib, a simple and easy-to-use library
Cross-platform game engine in Rust
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
SDL based generic 2D game engine
Pure C Game Engine
JavaScript-based game engine designed to empower developers
A fast, scalable, distributed game server engine/framework for C++
Clojure in Unity
Web powered cross-platform 3D, WebXR game engine
scriptable game engine with built-in support for 2D graphics and sound
Mahasona engine is an open source game engine.
Egret is a brand new open mobile game and application engine
A free ActionScript 3 library designed for developing 2D Flash games
Cross-platform 2D gaming middleware
Gomoku Game: Playing with Computer