Planets Facts Site - A powerful website that details information about planets.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
BigDataCloud IP Geolocation API - Next Generation IP GeolocationAPI
Splashify - Beautiful desktop wallpapers for Mac and Windows
Planet Explorer - Interactive global satellite images
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.