GRASS GIS (Geographic Resources Analysis Support System) is an open source, Free Software Geographical Information System (GIS) with raster, topological vector, image processing, and graphics production functionality that operates on various platforms through a graphical user interface and shell in X-Windows.
GRASS GIS is a property of GRASS GIS respective authors, vendors and developers. You can download GRASS GIS for your hardware. If you want to use GRASS GIS for other purpose, Please contact the authors, vendors and developers of GRASS GIS.