John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.
Moody Desktop - Change wallpaper timely, with shuffle and time you will have a new wallpaper every login. Specify multiple directories.
FCorp My Desktop - "ALL-IN-ONE" Desktop Related Tools.
MuralPix Wallpaper Changer - MuralPix Wallpaper Changer and Screen Saver
WallpapersEveryday - Gorgeous wallpapers on your desktop in just one click or auto-delivered at chosen time intervals.