By Bismarck.Rosalee 2015-08-10 01:06:59			
			
						
                     
                 
                Actually, Crystal Tools was what they used for XIV 1.0, before they tore it down to make a new engine (that they just called "Final Fantasy XIV Engine") similar to Luminous, but more streamlined for MMO's.
From what I could understand from the OF, XI was developed using some weird PS2 framework called DNAS.  I have no idea how it works, don't quote me on this.