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!!
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows
Wallpaper Wizard - Wow-worthy backgrounds for Mac
Artpip - Artistic wallpaper for your desktop, refreshed daily.