Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Spott - API to work with cities, countries and political divisions.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
BigDataCloud IP Geolocation API - Next Generation IP GeolocationAPI
Wallcat - Enjoy a new, beautiful wallpaper, every day.
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.