Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Walyk Wallpaper Changer - Walyk Wallpaper Changer allow you to change your wallpapers automatically or manually.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Wallpaper Wizard - Wow-worthy backgrounds for Mac