GRASS (‘‘Geographic Resources Analysis Support System’’) is a powerful, open-source desktop GIS application that supports “geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization”[http://grass.itc.it/intro/index.php]. Although the GRASS software includes a graphical interface, QGIS can serve as a more user-friendly interface via its GRASS plugin.
As of ‘’’'’27-Nov-2007’’’’’, the latest release is ‘’’'’GRASS 6.2.3’’’’’.
[http://grass.osgeo.org/ Official GRASS website]
[http://grass.osgeo.org/wiki/GRASS-Wiki GRASS Wiki]
[http://grass.gdf-hannover.de/wiki/GIS_Concepts GIS Concepts]