Aside from the sometimes annoying ads, Wowhead's site had excellent info on every item in the game.
The best thing was a comments section for each item, where uers would post more data about the items, such as what they're used for, how to find, etc.
https://www.wowhead.com/item=124113/...ather#comments
All I can find for FFXIV are sites that just repeat the tooltip, which is of no help when it's cryptic.