Hi all,
I came across this wonderful online library of Italian church music of the 16th to 18th century:
https://www.fortunato-santini.de/edition-santini.php

It originates from a collection of music by the Italian priest and musician Fortunato Santini (1777‒1861), which by some circumstances ended up in Münster, Germany. The university library edits some pieces from the collection (its huge, roughly 20 000 titles) and publishes them online. The editions look very clean, of course I can't check them. I couldn't find many of the pieces elsewhere and they are rarely recorded.

What's not ideal: the search options. Number of voices are given, but not wether it's SSA or STB or ... Also, some meta information like liturgical use is stored inside the document. Probably it would be good to at least link them in CPDL and store this kind of information there. This way they would also be found more likely...

Ah, I just see, they are uploaded to IMSLP instead: https://imslp.org/wiki/Category:Rosenberger,_Burkard

I would like to highlight a piece which I found particularly interesting, a Miserere à 9 by Pasquale Pisari. The piece has the exact same structure as Allegri's famous piece: Coro I à 5 - plainchant - Coro II à 4 - plainchant etc until the last verse à 9. But I have no idea how it sounds. Have a look if you like:
https://www.fortunato-santini.de/download/edition-santini_094.pdf