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…

iBooks is an e-book application by Apple Inc. for its iOS and macOS operating systems and devices.

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.

Audible is an online audiobook store.