Cabal Online. Definitely one of my favorite game. Also there was an alright game by ijji but i forget the name.
I tried runescape and the graphics looked like a clown threw up on them. But I'm definitely going to try the ones mentioned above.
S.U.N Online? it was fun. I use to play it alot. Then got bored. Though id be willing to start it again if i had friends to play it with.
What server?Dungeons & Dragons Online is pretty good in terms of being free and it is a pretty good game version of the pen and paper D&D