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
Real Time Strategy game engine supporting early Westwood classics
Desktop/Android/HTML5/iOS Java game development framework
Fast and lightweight JavaScript game engine built on WebGL and glTF
One framework for creating powerful cross-platform games
Open Source MMORPG Framework
Open source HTML5 game framework that offers WebGL and Canvas
Open source library for N64 development
A game framework written with osu! in mind.
Unity3D Client And C# Server Framework
CTFs as you need them
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Gideros Release version
ThinkPHP Framework
You can make it - Open Source MMORPG Platform
All-In-One program that combines multiple Fortnite Dev Account tools.
Arianne is an engine to develop multiplayer online games like Stendhal
Orx: Data-Driven Game Engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Game engine supporting many 3D/2D formats and graphic effects
Examples of procedural geometry for Unity3D C#