Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
AlReader - Alreader.com - new perspective on reading e-books.
Kindle Cloud Reader - Kindle Cloud Reader lets you read ebooks instantly in your web browser - no Kindle device required.
calibre - Ebook manager, viewer & converter