Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Readly - All-you-can-read magazines on all your devices
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Magzter - Magzter is the world's largest digital magazine newsstand with over 10,000+ magazines in its catalogue. Read them anytime and anywhere on iPad, iPhone, Android devices and the web.
Kindle Cloud Reader - Kindle Cloud Reader lets you read ebooks instantly in your web browser - no Kindle device required.
Texture - The "Netflix of Magazines" app