Godot is a powerful cross-platform game engine
Enables Roblox developers to use professional software tools
A simple and easy-to-use library to enjoy videogames programming
Desktop/Android/HTML5/iOS Java game development framework
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
Real Time Strategy game engine supporting early Westwood classics
Open Source MMORPG Framework
Self-hosted CMS platform based on the Laravel PHP Framework
CTFs as you need them
ThinkPHP Framework
A game framework written with osu! in mind.
You can make it - Open Source MMORPG Platform
Gideros Release version
lua dev plugin for unreal engine 4 or 5
Unity3D Client And C# Server Framework
Open source library for creative expression on the web, desktop, etc.
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
All-In-One program that combines multiple Fortnite Dev Account tools.
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Old-school 2D game engine
Ze Text Adventure game Builder : Create as you play !
Orx: Portable Game Engine