Getty Publications Virtual Library

"Free digital backlist titles from the Getty Publications Archives"

http://www.getty.edu/publications/virtuallibrary/089236338X.html

Project Gutenberg Free eBooks

Project Gutenberg website is where you can find high quality ebooks to download or read online. 45,000 free ebooks (epub or kindle) are available.

The website is free, but donations are accepted to fund the purchase and the process to digitize other books.

If you are not able to donate funds, you can assist in other ways: digitizing books, recording audio books, reporting errors are the listed other ways you can help.

Please note (from their website):

"Our ebooks are free in the United States because their copyright has expired. They may not be free of copyright in other countries. Readers outside of the United States must check the copyright laws of their countries before downloading or redistributing our ebooks. We also have a number of copyrighted titles, for which the copyright holder has given permission for unlimited non-commercial worldwide use.

The Project Gutenberg website is for human users only. Any real or perceived use of automated tools to access our site will result in a block of your IP address."

http://www.gutenberg.org/wiki/Main_Page

Pexels

"Free high quality photos you can use everywhere."

From their photo license web page:

"All photos on Pexels are under the Creative Commons Zero (CC0) license. This means you can copy, modify, distribute and perform the photos. The pictures are free for personal and even for commercial use. All without asking for permission or setting a link to the source. So attribution is not required. All in all the photos are completely free to be used for any legal purpose.

The CC0 license was released by the non-profit organization Creative Commons. Get more information about the license on the official license page.

RestrictionsIdentifiable people may not appear in a bad light or in a way that they may find offensive, unless they give their consent.

Do not suggest endorsement of products, services, etc. by displayed people or organizations. For example: do not place an image of Apple in a way that suggests Apple would recommend your product.

About Us
Currently we cover over 850 photos. Every week we add 30 new photos. All photos are hand-picked from free image sources. We make sure that all added pictures are high-quality and under the CC0 license. We only add photos from reliable sources like Unsplash, Gratisography or Little Visuals.

You have questions about the license or anything else related to Pexels? Then write us an email: info@pexels.com"

http://www.pexels.com/

Free Pixels

Free stock photos and images at freepixels.com.

Be sure to read the terms of use before you download any picture.

freepixels.com

http://www.freepixels.com

MiniBük

Publish your own small book with MiniBük. A "bite-sized book for busy people."

http://minibuk.com/index.php

New Old School Photos

Vintage photos, free of known copyright restrictions, from the public archives. 

http://nos.twnsnd.co/

Public Domain Pictures

"PublicDomainPictures.net is a repository for free public domain images. Download high quality HD photos or upload your own. Make money from your hobby, gain popularity and improve your photographic and graphic skills.
If you intend to use an image you find here for commercial use, please be aware that some photos do require a model or property release."

http://www.publicdomainpictures.net/