Godot is a powerful cross-platform game engine
Enables Roblox developers to use professional software tools
One framework for creating powerful cross-platform games
Real Time Strategy game engine supporting early Westwood classics
A simple and easy-to-use library to enjoy videogames programming
Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open source library for N64 development
Open Source MMORPG Framework
Open source library for creative expression on the web, desktop, etc.
A game framework written with osu! in mind.
You can make it - Open Source MMORPG Platform
Self-hosted CMS platform based on the Laravel PHP Framework
CTFs as you need them
Gideros Release version
ThinkPHP Framework
Unity3D Client And C# Server Framework
lua dev plugin for unreal engine 4 or 5
All-In-One program that combines multiple Fortnite Dev Account tools.
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
Old-school 2D game engine
utility collection for 2D game development in Java; sound-player