Godot is a powerful cross-platform game engine
Enables Roblox developers to use professional software tools
Real Time Strategy game engine supporting early Westwood classics
One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
A simple and easy-to-use library to enjoy videogames programming
Open source HTML5 game framework that offers WebGL and Canvas
Open Source MMORPG Framework
Fast and lightweight JavaScript game engine built on WebGL and glTF
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
Open source library for creative expression on the web, desktop, etc.
ThinkPHP Framework
lua dev plugin for unreal engine 4 or 5
CTFs as you need them
Gideros Release version
Unity3D Client And C# Server Framework
All-In-One program that combines multiple Fortnite Dev Account tools.
Arianne is an engine to develop multiplayer online games like Stendhal
An isometric arcade-style game of skill, puzzles and exploration
INSTEAD - Simple Text Adventure Interpreter.
Game engine supporting many 3D/2D formats and graphic effects
Ze Text Adventure game Builder : Create as you play !
Old-school 2D game engine