Regnum Online is a free fantasy massively multiplayer online role-playing game (MMORPG) game (although premium content is available for enhanced game play) which runs on both Windows and Linux and I must say it looks really good.
One thing which makes Regnum Online better than a lot of others MMORPG games (besides it's graphics and gameplay) is it's user base, currently aprox. 540,397 users being registered to Regnum Online.
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stargrave
15 years 2 weeks 3 days 1 hour ago
Non-free
As I can see, it is neither free nor open source.