Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
Splashify - Beautiful desktop wallpapers for Mac and Windows
WinDynamicDesktop - This app ports the Dynamic Desktop feature from macOS Mojave to Windows 10.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.