Quantum GIS (QGIS) is a cross-platform Geographic Information System (GIS). Quantum GIS project offers support for vector and raster formats, including spatially enabled tables in PostgreSQL using PostGIS, common GIS vector formats such as Shapefiles, and geo-referenced rasters (TIFF, PNG, and GEOTIFF).
Many plugins are available to dynamically add new functionality. Viewing of GRASS layers (vector and raster) is provided by a plugin. GRASS vector layers can be edited in QGIS.
Here are some key features of "Quantum GIS":
· 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