Bookoid Alternatives

Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.

Project Gutenberg is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired.

Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and Android-based device. You can discover and read over 630,000 books in the Kindle Store, including the latest bestsellers and new releases.

Google Play Books lets you search, preview, and buy millions of books using Google Book Search. Books in the public domain and certain copyrighted books can be read and downloaded in their entirety for free.

One web page for every book ever published. It's a lofty but achievable goal.

Apple Books is the single destination for all the books you love, and the ones you’re about to. Browse the Book Store, join Oprah’s new Book Club, keep track of what you’ve read and want to read, and listen to enthralling audiobooks. All in one place.

Scribd is a social publishing site, where tens of millions of people share original writings and documents.

EPUBReader is a Firefox and Chrome addon which lets you read ePub-files just in the browser. You don't need to install additional software!

Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.

Freebook Sifter lists free eBooks from various sources. They update the list daily and you can find free eBooks from Amazon sites around the world, Kobo, Nook, Project Gutenberg.