Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Splashify - Beautiful desktop wallpapers for Mac and Windows
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
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.
Wallpaper Wizard - Wow-worthy backgrounds for Mac