What are some alternatives?
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Flipboard - Your Personal Magazine. Find, follow and flip stories that change your world.
FBReader - FBReader is an e-book reader for various platforms. Features:
Inoreader - Dive into your favorite content. The content reader for power users who want to save time.
calibre - Ebook manager, viewer & converter
Pocket - When you find something you want to view later, put it in Pocket.