Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Komorebi - Komorebi is a wallpaper manager in Linux that uses the GTK+ and Vala libraries to support animated...
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.