Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Splashify - Beautiful desktop wallpapers for Mac and Windows
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Wallpaper Wizard - Wow-worthy backgrounds for Mac
5K macOS Wallpapers - Every default macOS wallpaper – in glorious 5K resolution!