I know of a few.

Phantasy star Online is good, but time consuming.
http://www.phantasystaronline.net/
Its also free now for PSO Ultima, STCHC or whatever its called and Eden

Another Half decent one is Conquer Online
https://account.91.com/common/Co.asp...om/&BillID=796
I've been playing it for a week but it seems alright. The only issue is its Korean so its one of those "Use real money to buy fake items" type games.

Dungeons and Dragons Online is my personal favorite!
https://signup.ddo.com/ddo.php?utm_s...eferral=127284
Unfortunately this game eats up ram so if you're computer can take it I'd play it

Hope that helped