What is the most popular MMO game that has an out-of-game API [closed]

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World of Warcraft is off the table, because of the "WOW Glider Lawsuit" of 2008. Also see: Where is Blizzards official World of Warcraft API?

But, what is the most popular (in terms of user开发者_JAVA技巧ship) MMO Game that does allow programmers to develop out-of-game things (like an Android app).

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EVE online has an API Here