Splashify - Beautiful desktop wallpapers for Mac and Windows
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
WLPPR - Beautiful mobile wallpapers made from satellite imagery
Wallpaper Wizard - Wow-worthy backgrounds for Mac
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.