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Portable Ultima Patches
A set of patches for Ultima 1 through Ultima 7 Part 2: Serpent Isle, which should theoretically be applicable to most installations of the games, regardless of source.
Pix’s Ultima Patcher
Pix’s Ultima Patcher is your one-stop method to ensure you have the most up-to-date copy of Ultima 1!
Ultima 1: A Legend Is Reborn (ERA: The Arken Throne)
An ambitious, but sadly defunct, attempt to remake Ultima 1 with a custom-built 3D engine.