recoll has worked great for a document index. https://www.lesbonscomptes.com/recoll/ https://www.lesbonscomptes.com/recoll/ I also recommend calibre for e-boo

recoll has worked great for a document index. https://www.lesbonscomptes.com/recoll/ https://www.lesbonscomptes.com/recoll/ I also recommend calibre for e-books, but I never got to the "document store" stage that I think some people have.