Devolia Geo is based on the API we created for Rien à me mettre !, a french fashion website which is also available as an iPhone application.
Basically, the service allows you to geolocate people using their GPS coordinates. The service returns their country and their city.
Devolia Geo is released under a MIT licence, which means you can do whatever you want with it.
Have fun and please give us somme feedback 
Resources:
- Project page
- Wiki page
- Install Devolia Geo
- Use Devolia Geo