Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Archive.org - Internet Archive is a non-profit digital library offering free universal access to books, movies...
AlReader - Alreader.com - new perspective on reading e-books.
ManyBooks.net - Thousands of free ebooks, pre-formatted for reading on your computer, smartphone, iPod, or e-reading device - ePUB, Kindle, eReader, PDF, Plucker, iSilo, Doc, RTF, Mobipocket, Newton Paperback, and zTXT ebooks ready to go!
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Open Culture - Discover thousands of free online courses, audio books, movies, textbooks, eBooks, language lessons, and more.