Geographic Resources Analysis Support System
Commonly referred to as GRASS, the Geographic Resources Analysis Support System is a free open source Geographic Information System (GIS) software package used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. GRASS is an official project of the Open Source Geospatial Foundation].