LibriVox - free public domain audiobooks
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Mobilism.org - A home for book lovers, app enthusiasts, and much more.
AlReader - Alreader.com - new perspective on reading e-books.