I recently started my own free stock photo site that you might find interesting for your list.
It’s called OneLeft Media and it’s a thinking-outside-the-box stock photo library that offers professional artwork for free without copyright restrictions. I create new artwork and update the site every other week with 10 fresh high-res photos.
The project can be found at www.oneleftmedia.com. Have a look and if you like my work I would feel honored if you could add me to your list.
Thanks a million!