Bookoid!

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.

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. You can buy ebooks for reading on your computer, Apple device, Android device, Nook, or Sony eReader in the Google ebookstore. All purchased eBooks are backed up online, and your page positions are automatically synced between devices.

Project Gutenberg is the place where you can download over 33,000 free ebooks to read on your PC, iPad, Kindle, Sony Reader, iPhone, Android or other portable device.

Aldiko is an e-book reader application for the Android operating system. It supports the EPUB industry standard format for digital publications and incorporates facilities for browsing online catalogs on thousands of books (including thousands of free public domain work) and downloading them directly into the users personal library. The application features a bookshelf-like user interface that lets user navigate their collection of eBooks. It also provides a customizable reading experience through configurable font and background color, font size and type, margin size, display brightness, page turn mode, etc. Additionally, the application allows users to import their own books to read them on the go. »

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

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

Download NOOK, and get access to over a million eBooks, newspapers, magazines- all just a touch away. Plus, free samples of ebooks & thousands of free titles.

Open Library is an online project intended to create “one web page for every book ever published”. Book database and digital lending libraryIts book information is collected from the Library of Congress, other libraries, and Amazon.com, as well as from user contributions through a Wiki-like interface. Open Library claims to have 6 million authors and 20 million books (not works), and about one million Public Domain books are available as digitized books.

With Kobo, you can read on your iPad, iPhone or iPod Touch anywhere, anytime.

Download eBooks and audiobooks from your library directly to your iPhone, iPad, and iPod Touch!

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.

Simply put, Blio is a full-featured eReader for people who care about what books look like.