Ryzom

Enter a unique science fantasy MMORPG and dive into a unique organic living world ! 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.