Kobo Books - Kobo Books is a best in the class eBooks and eReadering apps for many reasons.

AlReader - Alreader.com - new perspective on reading e-books.

AbeBooks - AbeBooks has millions of new & used books, rare books and out of print books.

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.

Occupy the Bookstore - Chrome extension to easily surface cheaper textbooks

iReader - iReader is one of the most accomplished ways to read the books right from your smartphones.