John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Spott - API to work with cities, countries and political divisions.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
BigDataCloud IP Geolocation API - Next Generation IP GeolocationAPI
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
IP Location - IPLocation.io provides a free lookup tool to check the location of your Public IP Address. It finds this data through various GEO IP databases and online services. Just enter an IP and check its location easily.