Mysterious Sosaria - - Music library, weapons guide, and 3D travel guide.
A Nocturne for the Avatar - - Information, hints, clues, cheats, and easter eggs for Ultima 4 through 9 and Serpent Isle. Also includes articles on game world cultures.
Project Britannia - - Joint project undertaken by U5 Lazarus and the U6 Project teams, producing a blank-slate version of the world of Britannia based on the Dungeon Siege engine.
Silva's Ultima Site - - Includes Virtues, story for Ultima I-IX, forums, and links to fan projects.
Trigon Dragon's Ultima Dox - - A project to scan and transcribe original Ultima documentation and Ultima maps to aid those who bought the Ultima I-VI CDROM or the Ultima Collection CDROM.
The Ultima Compendium - - Illustrated guide of the history, creatures, and magical arts.
The Ultima Delve - - Includes an encyclopedia, dungeons and reference guide to Britannia.
Ultima Dragons Internet Chapter - - A large virtual club founded in 1992 and dedicated to helping others with Ultima questions. With roster and links to major Ultima archives.