There are 2 repositories under mmo-engine topic.
Reldens - You can make it - Open Source MMORPG Platform
A Dark Ages Private Server Project
Deprecated master server for creating MMO games based on CRYENGINE
A way of handling time and time-related state changes in a highly customizable way, for use with games and virtual worlds
Край Серого Дракона - браузерная текстовая ролевая онлайн игра - https://lotgd.pp.ua
⚙️ 2D isometric rendering engine built on-top of Processing library. Inspired by EndlessOnline.
Eclipse-The Final Frontier (MMORPG Marker)
Start your game on a solid foundation with a full project folder structure, basic documentation for every module, and a complete collection of Interfaces and Scriptable Objects to build your game architecture.
A client agnostic MMO server Engine written in Rust
A three.js 3D world
Alphastorms MMO Engine
Follow along code of MMO Networking CPP series by Javidx9 - https://github.com/OneLoneCoder/