John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Wallpaper Cycler - NuonSoft WallpaperCycler is a powerfull utility to manage all your wallpapers and to automatically cycle between your wallpapers.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
Better Uptime - We call you when your website goes down