What are some alternatives?
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
Feedly - The content you need to accelerate your research, marketing, and sales.
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices