booklore

BookLore: A self-hosted, multi-user digital library with smart shelves, auto metadata, Kobo & KOReader sync, BookDrop imports, OPDS support, and a built-in reader for EPUB, PDF, and comics. Maintained by booklore-app on GitHub, where it has earned 818 stars from the community.

It's actively developed around angular, book-management, ebooks, and is a solid reference for anyone building with these tools.