Spott - API to work with cities, countries and political divisions.
Celestia - Real-time 3D visualization of space
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.
Heavens Above - Website for tracking Satellites, Space ships and other space objects.
Planet Explorer - Interactive global satellite images
See A Satellite Tonight - Free web app to explore satellite locations.