Wallpaper Wizard - Wow-worthy backgrounds for Mac
Unsplash Wallpaper - Gorgeous wallpapers on your Mac
Wallcat - Enjoy a new, beautiful wallpaper, every day.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
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.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads