calibre - Ebook manager, viewer & converter
Pocket Scanner - Pocket Scanner is the best app for quickly scanning documents to JPEGs or multi-page PDFs.
FBReader - FBReader is an e-book reader for various platforms. Features:
PaperScan - PaperScan Scanner Software is a powerful TWAIN & WIA scanning application centered on one idea: making document acquisition an unparalleled easy task for anyone.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
PaperSave - PaperSave is a complete document management, electronic workflow and transaction (invoice and gift) automation solution, for Microsoft Dynamics and Blackbaud.