addicitinggames.com battleon.com - adventure quest free RO servers lots of free games... you just gotta sift through all the ones claiming to be "free" that really require a paid membership to play, or really enjoy
I'm too lazy to read the entire topic, so I don't know if Knight Online or Rakion were mentioned, they're great games...
if u want a text based game, Torn City is the way to go! http://www.torncity.com/register.php?XID=88716