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"GEOTRANS (Geographic Translator) is an application program which allows you to easily convert geographic coordinates among a wide variety of coordinate systems, map projections, and datums."

Geocoding Tool

You can geocode a single location or a lot of locations. Geocoding is a translation from an address to a coordinate system. is a popular free geocoding service for addresses in the United States.  The site uses TIGER line data along with geocoding code written in perl to provide geocoding services for thousands of websites.  The site's creators also provide paid geo-related services.