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