Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
WallpapersEveryday - Gorgeous wallpapers on your desktop in just one click or auto-delivered at chosen time intervals.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Adolix Wallpaper Changer - Adolix Wallpaper Changer- free wallpaper changer software.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
BioniX Desktop Wallpaper Changer - Free desktop wallpaper picture changer/desktop wallpaper manager software.