GitHub - Full-Stack Javascript MMORPG engine and framework

Reconquer Engine provides all the necessary logic and game assets to build an OSRS-style MMORPG using Javascript. Upon building and running it for the first time, you'll have a fully functional MMORPG. It utilizes gltf-Transform for asset processing, a Node.js server with Express and Socket.io, and WebGL/three.js for browser-based graphics. Simple example implementations for the database, authentication, and payments are included, but you are encouraged to integrate your own systems. The game and engine are developed purely in Javascript (99.9% JS, 0.1% HTML, 0% CSS) including the asset exporter, server, and client.