Top MMORPG GitHub Repositories & Tools (2026)

TrinityCore Open Source MMO Framework (master = 12.1.0.69933, 3.3.5 = 3.3.5a.12340, cata classic = 4.4.2.60895)

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.

FOnline Engine is a flexible cross-platform isometric game engine

Open-source Asheron's Call client for .NET 10. The original game's behavior, a maintained codebase, a plugin API.

Highly Performant & Scalable Ultima Online Server Emulator