QuantumGIS
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:
- Support for spatially enabled PostGIS tables
- Support for shapefiles, ArcInfo coverages, Mapinfo, and other formats supported by OGR
- Raster support for a large number of formats
- Identify features
- Display attribute tables
- Select features
- GRASS Digitizing
- Feature labeling