TrinityCore Open Source MMO Framework (master = 8.3.7.35284, 3.3.5 = 3.3.5a.12340)

A MMOG engine of server.

A fast, scalable, distributed game server engine/framework for C++, include the actor library, network library, can be used as a real time multiplayer game engine ( MMO RPG/MOBA ), which support C#/Lua script/ Unity3d, Cocos2dx and plan to support Unreal.

rAthena is an open-source cross-platform MMORPG server.

A community replacement for Unity's abandoned UNET Networking System.

AzerothCore - Modular MMORPG Server. Based on MaNGOS -> TrinityCore -> SunwellCore

A free and open-source MMORPG server emulator written in C++

A free/open source client and automation tool for Ragnarok Online

Hercules is a collaborative software development project revolving around the creation of a robust massively multiplayer online role playing game (MMORPG) server package. Written in C, the program is very versatile and provides NPCs, warps and modifications. The project is jointly managed by a group of volunteers located around the world as well as a tremendous community providing QA and support. Hercules is a continuation of the original Athena project.

游戏服务器框架，网络层分别用SocketAPI、Boost Asio、Libuv三种方式实现， 框架内使用共享内存，无锁队列，对象池，内存池来提高服务器性能。还包含一个不断完善的Unity 3D客户端，客户端含大量完整资源，坐骑，宠物，伙伴，装备, 这些均己实现上阵和穿戴, 并可进入副本战斗，多人玩法也己实现, 持续开发中。

DEPRECATED - FFXI Server Emulator - See Project Topaz

An Ultima Online server emulator written in C# .NET

EQEmu - Open Source EverQuest Server

An emulator for the defunct MMORPG WildStar which supports build 16042 (Final Patch)

java编写的轻量级高性能mmorpg手游服务端框架，集成springboot。基本功能逐渐完善中。

⚔️ An online JavaScript 2D Medieval RPG.

This project aims to create an easy to use, extendable and customizable server for a MMORPG called "MU Online".

MMORPG是一个可以用来学习ARPG核心战斗的项目（不再维护）。http://v.youku.com/v_show/id_XOTE5NDg1MTg0.html?firsttime=0

OTX Server from:

Open-Source MMORPG Server Emulator

Stendhal is a fun friendly and free multiplayer online adventure game with an old school feel.

通用的实时流golang框架，可以方便的创建游戏服务/聊天服务等

Asheron's Call server emulator.

OpenKO is an open source version of the old school Knight Online MMORPG

Ryzom Core is the open-source project related to the Ryzom game. This repository is synchronized with the Ryzom Forge repository, based on the Core branch.

This repository holds the Open RuneScape Classic game framework

Tera DPS Meter

A modern Ultima Online server written in PHP

Online Role Playing Game (based on Laravel)

OpenMMO - Groundwork