calibre - Ebook manager, viewer & converter
Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
Calibre Web - Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks...
Tellico - Tellico is a KDE application for organizing your collections.
BookCAT - BookCAT is a powerful book collector database program which will help you catalog a book collection...
Book Catalogue - This is a simple book catalogue application, to store a list of your books.