Arianne
Arianne is a online multiplayer open source framework for developing internet games, like Ultima Online or Everquest, created by Miguel Angel Blanch Lardin with the assistance of developers around the world .It is composed of two different parts: server and client
Arianne's server is Marauroa: Marauroa is a Java implementation of the arianne design so that it is secure, fast and robust platform for providing content. The goal of Marauroa is to ease the creation of multiplayer games as Content management system eased the creation of webportals.
Arianne's client is not defined but a reference platform is available that is implemented using C++ and Blitz. The client ( on 2004/15/04) looks like this:
The goal of the Arianne project is to create a fantasy virtual medieval world using only open source tools and following a open source development model. In that world the goal is to run a role play game that will try to be as fun as pen and paper games.