Godot is a powerful cross-platform game engine
Real Time Strategy game engine supporting early Westwood classics
A simple and easy-to-use library to enjoy videogames programming
Enables Roblox developers to use professional software tools
One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
Open game and rendering engine packed into a JavaScript framework
Open source HTML5 game framework that offers WebGL and Canvas
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open Source MMORPG Framework
Gideros Release version
ThinkPHP Framework
CTFs as you need them
Unity3D Client And C# Server Framework
A game framework written with osu! in mind.
You can make it - Open Source MMORPG Platform
Open source library for N64 development
lua dev plugin for unreal engine 4 or 5
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Arianne is an engine to develop multiplayer online games like Stendhal
INSTEAD - Simple Text Adventure Interpreter.
Game engine supporting many 3D/2D formats and graphic effects
All-In-One program that combines multiple Fortnite Dev Account tools.
TX Library is a tiny graphics library for Win32 written in C++.