Seven Towers is the website of Marzo Sette Torres Junior, a member of the Exult team. It contains some Exult mods and Usecode C documentation.
The Titans of Ether used to run the Ultima 9: Redemption and Ultima: The New King projects for many years. In December 2016, Ultima 9: Redemption was cancelled, and the Titans embarked upon a new project called Corven - Path of Redemption, which isn't Ultima-related. They have since rebranded to Lycantic.
The Ultima 6 Project worked closely with Team Lazarus and some Team Elemental, and became the second major Ultima remake (after Lazarus) to reach completion.
The author of this remake used to work with Redemption, but he eventually left to start his own project. While Redemption focused on a totally new game, Infinity Eternal was more focused towards remaining faithful to certain parts of the plot of the original game, yet correct the flaws that haunted it.
Ultima 5 - Lazarus is finally complete, after 5 and a half years of development. It did what the more largely anticipated Ultima 1 - A Legend is Reborn could not - reach the finish line. After releasing two demos in a short span of time in 2004, Lazarus was officially released on 22nd December 2005.
The website for Ultima 5 for Morrowind went live in February 2005. The site doesn't seem to exist, but I haven't checked whether the project still exists elsewhere.
The Red Mage had released a demo of Ultima 8 for Neverwinter Nights, but renounced remaking Ultima 8 when he discovered that the Exile project already existed. The project resurfaced in September 2006, after the Exile project had been cancelled.
The authors of the demo of Ultima 8 for Neverwinter Nights decided to abandon remaking Ultima 8 when they realised that a remake for the game (Ultima 8 - Exile) already existed. Instead, they took up the task of remaking Ultima 7 under the name 'Agape'. However, this didn't work out either, and the project died in October 2004. Major Error took over the Ultima 7: Agape project, but nothing is known about current development.
Redemption began under the lead of Avatus. Problems arose when he left; the team lost motivation and the project was heading for a fall. In September 2004, however, Corv from Ultima - The New King offered to join forces, and the two teams merged to form the Titans of Ether.
After 12 years in development, the Titans of Ether also gave up on Ultima 9: Redemption and cancelled the project in December 2016.
The soundtrack [Spotify | YouTube] for Ultima 9: Redemption, composed in 2006-2008 by Matti Paalanen while the project was in the hands of the Titans of Ether, has survived.
Pagan-NWN is a recent remake of Ultima 8 using the Neverwinter Nights engine. It was started sometime in 2010, and had most of the areas mapped using the NWN toolset. It is currently inactive, the module as well as several screenshots were uploaded to Github on 20th March 2014 to make it available to the public.