Godot is a powerful cross-platform game engine
A simple and easy-to-use library to enjoy videogames programming
Enables Roblox developers to use professional software tools
Desktop/Android/HTML5/iOS Java game development framework
Open game and rendering engine packed into a JavaScript framework
Real Time Strategy game engine supporting early Westwood classics
One framework for creating powerful cross-platform games
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open source HTML5 game framework that offers WebGL and Canvas
CTFs as you need them
Open Source MMORPG Framework
lua dev plugin for unreal engine 4 or 5
ThinkPHP Framework
You can make it - Open Source MMORPG Platform
Open source library for N64 development
A game framework written with osu! in mind.
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
utility collection for 2D game development in Java; sound-player
JavaScript framework to build game engines, games, emulators and apps
INSTEAD - Simple Text Adventure Interpreter.
TX Library is a tiny graphics library for Win32 written in C++.