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 HTML5 game framework that offers WebGL and Canvas
Fast and lightweight JavaScript game engine built on WebGL and glTF
Open Source MMORPG Framework
You can make it - Open Source MMORPG Platform
ThinkPHP Framework
Open source library for creative expression on the web, desktop, etc.
lua dev plugin for unreal engine 4 or 5
CTFs as you need them
Gideros Release version
A game framework written with osu! in mind.
Self-hosted CMS platform based on the Laravel PHP Framework
Arianne is an engine to develop multiplayer online games like Stendhal
INSTEAD - Simple Text Adventure Interpreter.
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
JavaScript framework to build game engines, games, emulators and apps
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Old-school 2D game engine