Godot is a powerful cross-platform game engine
A simple and easy-to-use library to enjoy videogames programming
Enables Roblox developers to use professional software tools
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 library for creative expression on the web, desktop, etc.
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open source HTML5 game framework that offers WebGL and Canvas
Open Source MMORPG Framework
Open source library for N64 development
Unity3D Client And C# Server Framework
A game framework written with osu! in mind.
Self-hosted CMS platform based on the Laravel PHP Framework
Gideros Release version
ThinkPHP Framework
You can make it - Open Source MMORPG Platform
CTFs as you need them
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
Ze Text Adventure game Builder : Create as you play !
SDL based generic 2D game engine
Orx: Data-Driven Game Engine
Amateur 3D Game Engine