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
Artpip - Artistic wallpaper for your desktop, refreshed daily.
Splashify - Beautiful desktop wallpapers for Mac and Windows
AutoWallpaper - Using AutoWallpaper:
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.