What are some alternatives?
When comparing Google Play Books and Project Gutenberg, you can also consider the following products
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Scribd - Unlimited books, audiobooks & comics. Unparalleled discovery. Any device. $8.99/month
FBReader - FBReader is an e-book reader for various platforms. Features:
calibre - Ebook manager, viewer & converter
The new iPad Pro - 10.5 inch - Thinner and better
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices