Ryzom is a "science-fantasy" MMORPG from Winch Gate set on the planet Atys in the year 2531. Originally developed by Nevrax, Ryzom offers players a living world with rich ecosystems, big multiplayer battles, skill-based advancement, role-playing events, PvP, and more. An expansion called the Ryzom Ring was also released, that allows players to use the game's design tools to create their own role-playing events and scenarios.
Ryzom is one of only a few commercial-grade MMORPGs that are fully open source: client, server, tools, and media. Being open-source means that Ryzom draws on a vibrant community providing fixes and functionality above and beyond that of what the team can provide. It offers players a unique opportunity to become involved in the development of the game.