Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
calibre - Ebook manager, viewer & converter
FlippingBook - FlippingBook changes the way you present your documents
FBReader - FBReader is an e-book reader for various platforms. Features:
Flipsnack - Flipsnack | PDF to HTML5 flipbooks
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.