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Generic Mapping Tools vs GRASS: catalog facts
Generic Mapping Tools	GRASS
Free Free and open source under the GNU Lesser General Public License.	Free Free and open source, with community and commercial support available.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Processes geographic and Cartesian data Includes more than 30 map projections and transformations	Broad raster, vector and imagery processing Temporal framework for time series analysis
Requires supporting geographic data for features such as coastlines and political boundaries	Steep learning curve for newcomers Geared to analysis rather than simple map viewing
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.