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.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows
Wallcat - Enjoy a new, beautiful wallpaper, every day.