All these books are free to read: either they're distributed with a free license, or they're in the public domain.

All these books are free to read: either they're distributed with a free license, or they're in the public domain.

These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.

These books are available in EPUB format - good for Kindle, iBooks, Nook, Kobo.