Since 2006, [Gisgraphy](http://www.gisgraphy.com) is a free, open source framework that offers the possibility to do geolocalisation and geocoding via Java APIs or REST webservices. Because geocoding is nothing without data, it provides an easy to use importer that will automatically download and import the necessary (free) data to your local database ([OpenStreetMap](http://www.openstreetmap.org/), [Geonames](http://www.geonames.org/) and [Quattroshapes](http://www.quattroshapes.com/): more than 100 million entries). You can also add your own data with the Web interface or the importer connectors provided. Gisgraphy is production ready, and has been designed to be scalable(load balanced), performant and used in other languages than just java : results can be output in XML, JSON, PHP, Python, Ruby, YAML, GeoRSS, and Atom. One of the most popular GPS tracking System (OpenGTS) also include
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Strong candidate; weakest signal is auth clarity.