Spott - API to work with cities, countries and political divisions.
YuMe - A multi-screen video advertising company providing digital video brand advertising solutions.
BigDataCloud IP Geolocation API - Next Generation IP GeolocationAPI
Theremin - Multitouch synth instrument that makes an array of sounds
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.
Google Music Lab - Interactive experiments that use the Web Audio API