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
Real Time Strategy game engine supporting early Westwood classics
One framework for creating powerful cross-platform games
Open source HTML5 game framework that offers WebGL and Canvas
Fast and lightweight JavaScript game engine built on WebGL and glTF
You can make it - Open Source MMORPG Platform
Open Source MMORPG Framework
ThinkPHP Framework
lua dev plugin for unreal engine 4 or 5
CTFs as you need them
Gideros Release version
Open source library for creative expression on the web, desktop, etc.
A game framework written with osu! in mind.
Unity3D Client And C# Server Framework
Self-hosted CMS platform based on the Laravel PHP Framework
All-In-One program that combines multiple Fortnite Dev Account tools.
Arianne is an engine to develop multiplayer online games like Stendhal
Ze Text Adventure game Builder : Create as you play !
Orx: Portable Game Engine
INSTEAD - Simple Text Adventure Interpreter.
Game engine supporting many 3D/2D formats and graphic effects
Amateur 3D Game Engine