I have lots of PDF books scattered among multiple directories. I would love to have some software that makes me able to search for a specific book. Ideally, I would have the possibility to associate to each book the authors (multiple of them), a title, a year, multiple tags, and afterwards, to search by any field (e.g. all books written by an author, or books that have a specific tags, or books written between two years, etc.)
In my case, this is for scientific books, but I'm pretty sure such a software would work great for non-scientific books too.
Notice that I'm not always dealing with, strictly speaking, published books: I may want, for example, to include in the database some notes written by a professor, which have no ISBN or such.
I am on Linux (Xubuntu 20.04), bonus points for FOSS software.