John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Airytec Switch Off - Switch Off is a lightweight, easy-to-use, tray-based system utility that can automatically...
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
iBeezz - iBeeZz: activity manager for Mac OS X
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.
Shutdown8 - Shutdown8 is a simple program that allows users to shut down their computers with a timer.