
IT-HE Software is a unique site mostly dedicated to abusing the games' technical flaws and glitches (aka bugs). This page is famous particularly for its anti-walkthroughs (walkthroughs describing how to beat the game by breaking all the rules, exploiting bugs, being evil and enjoying it a good deal), but also for its extensive list of fun things to do in the games from Ultima 6 to 9. Even after having read through it several times, you can go back one day to read it again, and it will still make you laugh.
Nowadays, you can enjoy a new dimension of mischief via the related YouTube channel.
Formerly known as "The Codex of Editable Wisdom", this site is the latest of a long line of attempts at creating an Ultima encyclopaedia. Using wiki technology, this site has certainly reached this objective.
xu4 allows you to play Ultima 4 on modern operating systems, and is cross-platform as it uses SDL. Although the game is going through beta testing, it is supposed to be fully playable from beginning to end.
The Ultima Codex is the latest incarnation of Ultima: Aiera.
Check out the U6 maps.
See the launch post for info on The Digital Lycaeum.
This is the home of the Ultima 6 Nitpicker's Delight Patch among other things.
Brad Hannah is building an engine around Ultima 5's original game files, and gradually moving in the direction of an isometric 3D perspective.
higHChloride writes: "Ultima Online: Serpent Isle is a shard in active development featuring an ongoing recreation of the Serpent Isle map. The cities of Monitor, Fawn, and Moonshade are already completed, as is the Inn of the Sleeping Bull, and players are invited to log on now and begin their adventures. Alongside tile-by-tile recreations of the original locations, there are new areas which take advantage of unused or previously inaccessible parts of the map. The shard is running on modified Stygian Abyss era rules and PvP is enabled. A customized client is offered which includes both artwork and music featured in the original game. You can find more by visiting https://uoserpentisle.com."
This is not a website, but a Facebook group where the Ultima Dragons that are still active hang out.
See the Remakes and Engines section of the U7BG Guide for more information about The Bread Gate.