9Dragons is ..what it is, somewhat innovative in structure, but as a whole all those games are just spin-offs of the other, nothing really good out there for "free" unless you want to pirate things..Which even still doesn't compare to the full experience you get paying for the game. Rappelz, FLYFF, RYL II, are some that come to mind that I remember playing for short duration or at least reading about..So look into those if you wish.
As stated before, get EVE. It's certainly worth it and Guild Wars is pretty decent.