Free stock photo sites

Described here: http://www.plagiarismtoday.com/2013/01/22/foter-open-licensed-photos-for-wordpress/

"Though some sites, such as Morguefile (previous coverage) and Stock.xchng (previous coverage) offer free stock photos that you can use without concern, the libraries are generally limited and it may be difficult to find the photo you want or need. Wylio, Xpert, OpenAttribute and, most relevant to WordPress bloggers, PhotoDropper (to name just a few)."