I just wanted to highlight how The Croaking Fane adventure, by Michael Curtis and published by Goodman Games as part of the series Dungeon Crawl Classics (adventure #77, nonetheless!) is an obvious Blackmoor tribute.
The world of Dungeon Crawl Classic can be classified as a world setting, although the adventures are designed to be easily dropped in other worlds with minumum effort, so I though that perhaps this is the right section to highlight this, but, if I got it wrong, I'm sure that an efficient mod will move it to the right place.

Here we have the confirmation that the world of DCC is not arguably a setting on its own, but it is actually a setting on its own.

I just found it: https://goodman-games.com/aereth/
The world is called Áereth, and the gazetteer that you mentioned must be this: https://goodman-games.com/store/product ... wn-realms/

The more I read about Áereth, the more I have the impression that it is very similar to a revisitation of Blackmoor/Mystara.