Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Calibre Web - Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks...
Apple Books - The all-new Apple Books has been redesigned to make finding, reading, and listening to books a beautiful, effortless experience on iPhone and iPad.
calibre - Ebook manager, viewer & converter
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Project Gutenberg - Project Gutenberg offers free ebooks to download.