Becrux Wally - Wally is a Qt4 wallpaper changer, using multiple sources like files, folders, FTP remote folders, Flickr, Panoramio, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, Google, Vladstudio and deviantART images. Now it's available in many languages!!
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.