calibre - Ebook manager, viewer & converter
DialogTech - DialogTech is an end-to-end call attribution and conversion platform.
FBReader - FBReader is an e-book reader for various platforms. Features:
Invoca - Call tracking & analytics software
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.