Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
Pexels - Find the best free stock images about Browser Home Page. Download all photos and use them even for commercial projects.
Splashify - Beautiful desktop wallpapers for Mac and Windows
Good Free Photos - Large free stock photo site with thousands of public photos
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.