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

Latest stable release: GRASS GIS 7.8.3 with Python 3, PROJ 6 and GDAL 3 support

Mac OSX Windows Linux
... and Addons | Source Code

Newcomers: How to start with GRASS GIS?

Screenshots (click for more)

Code quality check: Travis CI build status
Module of the Day
d.vect.chart Displays charts of vector data in the active frame on the graphics monitor.

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