#geocoding
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Nominatim
A tool to search OSM data by name and address and to generate synthetic addresses of OSM points (reverse geocoding) -
Geonames: Postal Codes
Free (CC Attribution licence) web service for postcode lookups. Lat/Lng results in JSON.Categories
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IP to Location Service
Specify ipaddress parameter and it returns XML string with the country associated with the IP -
Hungry Machine Blog: Super fast IP to lat/lng in Rails
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Calculating Distance in Miles from Latitude and Longitude
Uses Google’s GeoCoding API and some simple maths in SQLCategories