You should try to play the games made by Aeria. All you need to do is download and register, but and then most of their game are either mmorpg, or rpg(mostly mmo though)!
I'm sorry but all those games really SUCK. In my opinion, these are the better >free< ones: Rappelz, Cabal Online, Atlantica Online and of course, Dekaron
try checking out games on http://us.bigpoint.com/ there always fun (you make 1 account for all the games). If you like other types of games check out the games like adventure quest dragonfable mechquest and there is a new mmorpg in the series of games