Quantum GIS (QGIS) is a Geographic Information System (GIS) built for Linux/Unix, that works also on Windows and MacOS X. QGIS supports vector, raster, and database formats. QGIS is licensed under the GNU Public License.

Some of the major features include:

  1. Support for spatially enabled PostGIS tables
  2. Support for shapefiles, ArcInfo coverages, Mapinfo, and other formats supported by OGR
  3. Raster support for a large number of formats
  4. Identify features
  5. Display attribute tables
  6. Select features
  7. GRASS Digitizing
  8. Feature labeling