Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Plastuer - Plastuer is a Windows application for setting GIFs, videos, and web pages as your wallpaper.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
DeskScapes - DeskScapes is a program that allows users to have animated wallpaper on their Windows desktop.
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.