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