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

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