Bigfoto describes themselves as the royalty-free photo agency. There’s no login and the photos can be used however you like. Thanks to it’s community of amateur photographers, the gallery is ...

13. Skitterphoto–License-free photos, free to use under CC0. 14. Life of Pix–High-quality, public domain images with no copyright restrictions. 15. Pexels–Searchable database of CC0 images.

Before jumping on to searching copyright-free images, you need to be wary of the ... must be shared under the same terms) and ND (no derivatives or adaptations of the work are permitted).