calibre - Ebook manager, viewer & converter
Zoho CRM - Omnichannel CRM for Businesses of all sizes
FBReader - FBReader is an e-book reader for various platforms. Features:
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.