DealOz.com - Save time. Save money. Discover. Search new and used books, textbooks, and ebooks using the most trusted shopping comparison site, DealOz.com.
calibre - Ebook manager, viewer & converter
AbeBooks - AbeBooks has millions of new & used books, rare books and out of print books.
FBReader - FBReader is an e-book reader for various platforms. Features:
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Occupy the Bookstore - Chrome extension to easily surface cheaper textbooks