This PHP library aims to be the most functional geo-aware tool because it includes the providers of ArcGISOnline, GeoIP2, Google Maps, GoogleMapsBusiness, MaxMindBinary, Nominatim, TomTom, and Yandex. What this library provides is powerful abstraction layer for geocoding manipulations, according to the author. A complete guide to use the PHP library is available on William Durand's GitHub site.
Our API directory now includes 146 location APIs. The newest is the LongLatToLocation API. The most popular, in terms of mashups, is the foursquare API. We list 86 foursquare mashups. Below you'll find some more stats from the directory, including the entire list of location APIs.