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Quantum GIS (QGIS) is a Geographic Information System (GIS) built for Linux/Unix. QGIS supports vector, raster, and database formats. Some of the major features include:
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1. Support for spatially enabled PostGIS tables
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2. Support for shapefiles, ArcInfo coverages, Mapinfo, and other formats supported by OGR
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3. Raster support for a large number of formats
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5. Display attribute tables