Final Fantasy Compendium was a long-running fansite founded in April of 2000 as part of RPGClassics. It was maintained by Daniel Orner, aka Cidolfas, with an aim to be a comprehensive guide to the entire Final Fantasy series. Site updates ended on June 4th, 2009, with the owner citing having less time to work on the site and that the amount that the series had grown in the nine years made it hard to keep up.
The Final Fantasy Compendium covered two aspects of the series: the story and setting of the series, including the full story of every game, characters, places, organizations, species, and terms the players come across in their gameplay; and the prevalent and recurring themes and concepts used throughout the series, ranging from monsters, summons, jobs, items, magic/abilities, etc. It was part of the website's aim to present an overall view of the series instead of focusing on one individual game.
As of February 2019, the site appears to have gone offline.