Guru Dragon's Ultima Encyclopedia

Guru Dragon's Ultima Encyclopedia is a website dedicated to all things Ultima. The Encyclopedia covers a broad range of topics, like the professions, persons and bestiarity of Ultima, complete with a number of illustrations from the original documentation. Guru Dragon also has a section about Richard Garriott, Ultima-humor as well as downloads for Ultima fonts, music, upgrades Ultima III NES sprites and scans of the manuals that came with the original games.

It appears to be active and updated (relatively) regularly. Online as of January 2007, latest update 7/2007.