I see that @OtisTDog already linked to it in the List of I6 Documentation, but I just stumbled upon this by web search and it seems to not have had much mention on IntFiction:
The Z-machine Standand 1.1, annotated by Jared Reisinger, reformatted for the web (including turning internal references to other sections into links). It’s more navigable (and more attractive) than the official Z-machine Standard. Otis called out this improvement in particular: