I have played so many MMO games, the ones I currently play are Corum online (level 113), Phantasy star online private server (level113) and Knight online (level 46 or 47).
I have played Mu Online private server but I maxed my level and had best equips so nothing else I could do on it.
I have played ROSE online and way to many to list but the 3 at the top are the ones I play right now.
BTW Corum online is made by same people as Flyff. Might play that sometime.