MaxMind GeoIP is a set of APIs for looking up the location of an IP address, including the country, region, city, latitude, and longitude. Free GeoLite databases are available at http://www.maxmind.com/app/geolitecity
geoLucene is an extension of Lucene that allows to effectively index and search documents that contain locational information (longitude/latitude). It uses R-tree as a spacial index. See http://www.gossamer-threads.com/lists/lucene/java-dev/53378.
IPLServer is part of a client/server technology for ip location.
It is queried from IPLClient or other clients and delivers data like latitude, longitude, country and city.
Mozcow GeoEnabler shall be able to convert an IP-address or a domain name into longitude and latitude values, which in their turn are supposed to be visualized appropriately.
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