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3geonames is A simple location code mapping latitude,longitude to a single alphanumeric string, or three locality names.
3geonames
GeoCode is an open source Geolocation Code.
Put your data on a map with this tool. Batch geocode places, ip addresses to latitude,longitude and elevation. Build heatmaps, clustermaps, plain maps from text data.
Geocode.XYZ
Geoparse and batch geocode places to X,Y and Z.