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
Open source HTML5 game framework that offers WebGL and Canvas
Real Time Strategy game engine supporting early Westwood classics
Fast and lightweight JavaScript game engine built on WebGL and glTF
Desktop/Android/HTML5/iOS Java game development framework
One framework for creating powerful cross-platform games
Open Source MMORPG Framework
Open source library for N64 development
ThinkPHP Framework
You can make it - Open Source MMORPG Platform
A game framework written with osu! in mind.
CTFs as you need them
Unity3D Client And C# Server Framework
Self-hosted CMS platform based on the Laravel PHP Framework
Gideros Release version
Open source library for creative expression on the web, desktop, etc.
lua dev plugin for unreal engine 4 or 5
Arianne is an engine to develop multiplayer online games like Stendhal
All-In-One program that combines multiple Fortnite Dev Account tools.
Examples of procedural geometry for Unity3D C#
INSTEAD - Simple Text Adventure Interpreter.
Old-school 2D game engine