Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Wallpaper Wizard - Wow-worthy backgrounds for Mac
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
Wallcat - Enjoy a new, beautiful wallpaper, every day.