I’m using MaxMind geo-ip data for my service. Currently there is only a JSON API and a HTML widget making use of the JSON API. The service is in a public beta right now. I want to see whether the geo-ip data is accurate and how much stress the server could take. Everyone is invited to use the web service and report any issues.
However there are plans to implement a XML API and also making more information available through the service. Best part is all this comes free of charge and without advertisements, forever. Only thing I would request is a link back; Not compulsory. You can see the HTML widget in action right here in the blog as well, see the right column block “You are from…”.
All the code behind the web service is also available under the open source license GNU GPL v3. You could also start your own web service with the code, ;).
Right now all the hosting expense is from my own account, I would hope I will receive some donations when I have to move to better hosting plan because I’m getting a lot of traffic.