Ryzom Core is the open-source project related to Ryzom Game. Written in C++, Ryzom Core contains the whole code (client, server, tools) used to make the commercial MMORPG Ryzom. Ryzom Core is a toolkit for the development of massively multiplayer online universes. It provides the base technologies and a set of development methodologies for the development of both client and server code.
Check out our manual on getting the Ryzom source for instructions on how to download the source code. After getting the source code you will want to check out GNU/Linux or Windows instructions on how to build the source code.