Amazon.com, also called Amazon, is an American electronic commerce and cloud computing company.

Google Play Books (formerly Google eBooks) is an ebook digital distribution service operated by Google. Users can purchase and download ebooks from Google Pla…

Project Gutenberg (PG) is a volunteer effort to digitize and archive cultural works.

Scribd is a digital library and e-book and audiobook subscription service that includes one million titles.

Audible is an online audiobook store.

Amazon Kindle is a series of e-readers designed and marketed by Amazon.com.

Goodreads website allows individuals to freely search Goodreads' database of books, annotations, and reviews.

Wikibooks (Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a wiki-based Wikimedia project hosted by the Wikimedia Foundation for the creation of f…

Internet Archive is a nonprofit digital library which stores a copy of millions of web page history.

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…