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/

P D Photo

"PDPhoto.org is a repository for free public domain photos. Unless something is clearly marked as being copyrighted, you can assume it is free to use. But if you intend to use an image you find here for commercial use, please be aware that standards for such use are higher. Specifically, you should assume no model release was obtained. And pictures featuring products or property should be used with care. The photos are here to be used..."

http://www.pdphoto.org

Little Visuals

Would you like to receive 7 hi-res zipped images in your inbox every 7 days?

Use them anyway you want - click here for the public domain dedication.

http://littlevisuals.co/

GRATISOGRAPHY

"Free high-resolution pictures you can use on your personal and commercial projects.

Click on an image to download the high-resolution version. New awesome pictures added weekly!

All pictures were captured by Ryan McGuire of Bells Design and free of copyright restrictions."

http://www.gratisography.com/

Unsplash

"Free, click for explanation, hi-resolution photos. 10 new photos every 10 days."

http://unsplash.com/

List Of Free Stock Photos

"Finding great stock photos is a pain. You’re left with either low-res amateur photos, people wearing cheesy headsets, or photos that are out of budget for the project you’re working on. Below is an ongoing list (so bookmark it) of the best stock photo sites I’ve come across.

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• Little Visuals http://littlevisuals.co/
• Unsplash http://unsplash.com/
• Death to the Stock Photo http://join.deathtothestockphoto.com/
• New Old Stock http://nos.twnsnd.co/
• Superfamous (requires attribution) http://superfamous.com/
• Picjumbo http://picjumbo.com/
• The Pattern Library http://thepatternlibrary.com/
• Gratisography http://www.gratisography.com/
• Getrefe http://getrefe.tumblr.com/
• IM Free (requires attribution) http://imcreator.com/free"

https://medium.com/design-ux/62ae4bcbe01b