calibre - Ebook manager, viewer & converter
Issuu - Issuu is the leading digital publishing platform delivering exceptional reading experiences of magazines, catalogs, and newspapers.
FBReader - FBReader is an e-book reader for various platforms. Features:
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
NeeView - Display two images simultaneously
Magzter - Magzter is the world's largest digital magazine newsstand with over 10,000+ magazines in its catalogue. Read them anytime and anywhere on iPad, iPhone, Android devices and the web.