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!!
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
DesktopSlides - DesktopSlides is a light and user friendly desktop wallpaper changer for windows.
Splashify - Beautiful desktop wallpapers for Mac and Windows
Random BackGround - Random BackGround desktop wallpaper slideshow with advanced features for Windows
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.