There are 39 repositories under mmorpg topic.
TrinityCore Open Source MMO Framework (master = 18.104.22.168345, 3.3.5 = 3.3.5a.12340)
Unity3D Client And C# Server Framework
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.
#1 Open Source Unity Networking Library
Complete Open Source and Modular solution for MMO
rAthena is an open-source cross-platform MMORPG server.
A free and open-source MMORPG server emulator written in C++
A free/open source client and automation tool for Ragnarok Online
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。
Framework to create an RPG or MMORPG (with the same code) in the browser with Typescript
一个基于Entity-Component模式的灵活、通用、可扩展的轻量战斗（技能）框架，配置可选使用ScriptableObject或是Excel表格. A flexible, generic, easy to extend, lightweight combat (skills) framework based on Entity-Component pattern. Configuration can choose to use ScriptableObject or Excel tables.
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.
DEPRECATED - FFXI Server Emulator - See Project Topaz
An emulator for the defunct MMORPG WildStar which supports build 16042 (Final Patch)
An Ultima Online server emulator written in C# .NET
Combined Resource Folder from Multiple Sources of certain anime game
Stendhal is a fun friendly and free multiplayer online adventure game with an old school feel.
EQEmu - Open Source EverQuest Server
Archived, read-only repository. New repository: https://github.com/opentibiabr/otservbr-global
This project aims to create an easy to use, extendable and customizable server for a MMORPG called "MU Online".
Easy to use high performance Network library for Unity 3d
Reldens - You can make it - Open Source MMORPG Platform
Tataru Helper - application for translation of in-game texts in Japan MMORPG - Final Fantasy XIV. The texts are understood as MSQ, cutscenes, quests, NPC replicas, etc.
Ryzom Core is the open-source project related to the Ryzom game. This community repository is synchronized with the Ryzom Forge repository, based on the Core branch.
Asheron's Call server emulator.
Unity client application for Nine Chronicles, a fully decentralized idle RPG powered by the community.
OTX Server from:
FOnline Engine is a flexible cross-platform isometric game engine
This repository holds the Open RuneScape Classic game framework
A Golang MapleStory (v28) server