Godot is a powerful cross-platform game engine
Enables Roblox developers to use professional software tools
Real Time Strategy game engine supporting early Westwood classics
A simple and easy-to-use library to enjoy videogames programming
Open Source MMORPG Framework
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
Open game and rendering engine packed into a JavaScript framework
One framework for creating powerful cross-platform games
Fast and lightweight JavaScript game engine built on WebGL and glTF
ThinkPHP Framework
Open source library for creative expression on the web, desktop, etc.
lua dev plugin for unreal engine 4 or 5
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for N64 development
You can make it - Open Source MMORPG Platform
A game framework written with osu! in mind.
CTFs as you need them
Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
utility collection for 2D game development in Java; sound-player
INSTEAD - Simple Text Adventure Interpreter.
TX Library is a tiny graphics library for Win32 written in C++.
OgreWin3D
Game engine supporting many 3D/2D formats and graphic effects