Are there any games out there like World of Warcraft, but also compatible with Mac?

I did a World of Warcraft trial, and I'm pretty disappointed of how you have to pay 15 dollars a month just to play the game. I would like to play a game that is like World of Warcraft, or like like Allods. (though it is not compatible with the Mac, I wish it was.) I'm not really good at searching for these kinds of things on Google, Bing, or Yahoo Search, so are there any games out there? (I ALREADY KNOW ABOUT THE GAMES DIABLO AND STARCRAFT, they are part of the Blizzard company.)