Found this board games website:
boardgames.com
However, do not try to use it in this "raw" form; for some mysterious reason it will redirect you to amazon.com. Instead, click here:
https://boardgames.com/browseAlmost all the games that I found here are also in BGG. However, searching is different: in BGG, the search is done against the game's name. Here, it is done against the game's description.
I performed a search for, yes, you guessed it, Carcassonne. The results included the HiG games, official expansions, many fan expansions, including "The Constable" (Il Constabile), in original Italian and with a decent English translation (but not the best). I haven't seen this expansion anywhere else.
I also got to know many Carcassonne-inspired games. Kar-kas-onn is one such game for which I'm in contact with the author; perhaps will present it here at a later date.
There will be some references to Carcassonne that have nothing to do with this game, but not many. I think it is worth paying a visit, then cross-referencing with BGG.
Linkback: https://www.carcassonnecentral.com/community/index.php?topic=6273.0