calibre - Ebook manager, viewer & converter
AlReader - Alreader.com - new perspective on reading e-books.
FBReader - FBReader is an e-book reader for various platforms. Features:
iReader - iReader is one of the most accomplished ways to read the books right from your smartphones.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Quickreader - Quickreader is a book reading application for the leading smartphones that is combining the solution of two main issues of the book readers namely book reader and availability of books from the leading publication houses.