Best free Mac OSX "massively multiplayer" games

Massive Multiplayer games expand this idea onto a grand scale, where thousands of players share the same living world. These games blur the line between story and community, with each player adding to the larger tapestry. You can be a lone adventurer, a guild leader, or just a wanderer crossing paths with strangers who might become allies—or rivals. The appeal lies in that persistent, evolving universe, where the game never really pauses and the world keeps moving, with or without you.