Quantum GIS (QGIS) is a user friendly Open Source Geographic Information System (GIS) that runs on Mac OS X, Linux, Unix, and Windows. QGIS supports vector, raster, and database formats. QGIS is licensed under the GNU General Public License. QGIS lets you browse and create map data on your computer. It supports many common spatial data formats (e.g. ESRI ShapeFile, geotiff). Here are some key features of "Quantum GIS":

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