calibre - Ebook manager, viewer & converter
Gnome Catalog - Cataloging software for CDs and DVDs. Catalog your dvds/cds and files in your hard disk.
FBReader - FBReader is an e-book reader for various platforms. Features:
Extreme Movie Manager - eXtreme Movie Manager is a powerful software to manage your movie collection.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Where Is It? - WhereIsIt is a Windows application, designed to organize and maintain a catalog of your computer media collection, including CD-ROMs, audio CDs, MP3s, removable disks...