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:
FileBot - FileBot is the ultimate tool for organizing and renaming your Movies, TV Shows and Anime as well as fetching subtitles and artwork. It's smart and just works.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
TheRenamer - Automatically rename and organize your TV shows and Movies. Also moves them to your Media Library!