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GeoServer - The reference implementation of the Open Geospatial Consortiums WFS and WMS services, GeoServer is...
GeoNode.org - Open Source Geospatial Content Management System
Mapserver - MapServer is an Open Source platform for publishing spatial data and interactive mapping...
Clearip - Clearip provides the IP intelligence and fraud detection API in the market.
QGIS - QGIS is a desktop geographic information system, or GIS.
WIPmania - WIPmania provides a number of free products and services based on WorldIP geolocation database.