Tellico - Tellico is a KDE application for organizing your collections.
Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
Book Catalogue - This is a simple book catalogue application, to store a list of your books.
BookPedia - Whether books line every wall of your house or barely fill one shelf, Bookpedia is the perfect...
BookDB - BookDB is a free book catalog/catalogue program from Spacejock Software.
calibre - Ebook manager, viewer & converter