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Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) technology built for vector and raster geospatial data management, geoprocessing, spatial modelling and visualization.

GRASS GIS is Free, Libre and Open Source Software released under the terms of the GNU General Public License (GPL v2) . GRASS GIS is also a founding member and an affiliated project of the Open Source Geospatial Foundation

GRASS GIS contains over 350 modules to process and render geographic data. The software allows to manipulate a variety of raster, vector and 3D formats through its unique LOCATION/MAPSET concept. The later provides an efficient way to create, store and manage spatial information.

GRASS GIS comes with an intuitive graphical user interface and a command line syntax, usefull for automation and production. GRASS GIS can interface with printers, plotters, digitizers, and databases to develop new data as well as manage existing data.

GRASS GIS runs on Linux, Mac and Windows. It comes with both an intuitive graphical user interface and a command line syntax usefull for automation and production.

GRASS GIS contains over 350 modules to process and render geographic data. The software allows to manipulate a variety of raster, vector and 3D formats, and run simple to advanced spatial analysis and modeling. GRASS GIS can connect to spatial databases but also interface with a variety of third-party systems and libraries.