The Mapbox AR Scenekit Swift SDK offers a location-based augmented reality platform. Mapbox supports live location data aggregated anonymously, points of interest, and 3D elevation renders. This SDK takes advantage of Apple's ARKit to deliver virtual terrain experiences without compromising application size.
Wikimapia is a web service that allows users to edit information on a world map in a wiki format. Users of the site can add places, edit them, and get the information previous users have entered. The info there is currently pretty sparse, but the service is rather new. The company also recently released a Wikimapia API that supports getting information from the web service.
Google has just announced the addition of a valuable new feature for the Google Maps API (the most popular API in our API directory): reverse geocoding. If you are not familiar with geocoding, it is the process of converting an address into a latitude/longitude pair. Likewise, reverse geocoding is the process of converting a latitude/longitude pair into an address. Developers using the Google Maps API have had access to geocoding since its release in June 2006, and geocoding has been integrated with many of the map mashups developed with this API.