calibre - Ebook manager, viewer & converter
tinyMediaManager - A multi OS media manager written in Java/Swing
FBReader - FBReader is an e-book reader for various platforms. Features:
Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Data Crow - Data Crow is the ultimate media cataloger and media organiser.