this link looks useful https://medium.com/p/62ae4bcbe01b 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/