calibre - Ebook manager, viewer & converter
Invoca - Call tracking & analytics software
FBReader - FBReader is an e-book reader for various platforms. Features:
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Marchex - Marchex is a mobile advertising analytics company that connects online behavior to real-world, offline actions.