LibraryThing is a social cataloging web application for storing and sharing book catalogs and various types of book metadata. It is used by authors, individua…
Google Play Books (formerly Google eBooks) is an ebook digital distribution service operated by Google. Users can purchase and download ebooks from Google Pla…
Wikibooks (Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a wiki-based Wikimedia project hosted by the Wikimedia Foundation for the creation of f…