The original source code for Ultima VII: The Black Gate has been decompiled! This is a huge milestone because the source for the original game was lost many decades ago. The author, Kitrinx, has stated that decompiling Serpent Isle is next!
github.com/Kitrinx/Ultima7_D…
Some interesting trivia: the editor for UW1 seems to have had a sprite for every object, even those that wouldn't show one in game. Here's the editor sprite for our friend Bragit.