General Information
GRASS is a Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. It is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.
Pre-Installation Notes
System Requirements: Windows 7+, Mac OSX or higher, or Linux.
Download
Download GRASS from the provider's website
Training
GRASS: Wiki-Help Site
GRASS: FAQs
GRASS: Documentation
Referenced from: GRASS.osgeo.org