No one has mentioned iLibrarian yet. No idea how its feature set compares to Zotero or Mendeley (I haven't used them much as I found them annoying in some ways)

No one has mentioned iLibrarian yet. No idea how its feature set compares to Zotero or Mendeley (I haven't used them much as I found them annoying in some ways) but there is a free self hostable version as well as the SaaS product. It is sufficient for managing my archive of papers. https://i-librarian.net/ https://i-librarian.net/