I visit FFXIV Core every now and then, but I'm not a huge fan of the guy that runs it. He's done a lot of dasterdly things that I just don't agree on (e.g. selling 'beta keys' by donating to the site, deleting posts that he doesn't agree upon with no warning, ripping people's YouTube videos and putting them on his own channel without permission, etc.).

Zam and Eorzeapedia seem like decent enough places though, and Zam's database is pretty good. Yellow Gremlin also looks like a good site for a database.