ISO Republic is another Creative Commons license stock photo website, with a ton of images you can download royalty free. With any stock photo site that deals with public domain images, you will find a spectrum of low- to high-quality photos. But even at the lower end of things, the photos are still pretty decent. All of these images fall into distinct categories, and the organization on the site is solid. As another copyright-free resource for images, ISO Republic is well worth checking out.