theres quite a few out there..i cannot name them because i dont know them lol...but i would highly suggest world of warcraft.. yeh it you do have to pay for it £8.99 a month pretty cheap and the Game and the Expansion is cheap at £9.99 each...if your a person that stick to "Try before you Buy" visit
www.trywarcraft.com and download your 10day free trial..it well worth it mate