Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
Universal Book Reader - Just like its name, Universal Book Reader is really a universal book reading application allowing you to read the eBooks from the convenience of your smartphones.
Tellico - Tellico is a KDE application for organizing your collections.
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Book Catalogue - This is a simple book catalogue application, to store a list of your books.
iReader - iReader is one of the most accomplished ways to read the books right from your smartphones.