Global Mapper is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is QGIS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Global Mapper and four of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Global Mapper are GRASS GIS (Free, Open Source), gvSIG Desktop (Free) and SAGA GIS (Free, Open Source).
QGIS, formerly Quantum GIS, is a user friendly open source Geographic Information System (GIS) licensed under the GNU General Public License that runs on Linux, Unix, Mac OSX, and Windows and supports numerous vector, raster, and database formats and functionalities.
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Almost everyone thinks QGIS is a great alternative to Global Mapper.
GRASS GIS (Geographic Resources Analysis Support System) is an open source, free software (FOSS) Geographical Information System (GIS) with raster, topological, vector, image processing, and visualization functionality.
gvSIG is a Geographic Information System (GIS), that is, a desktop application designed for capturing, storing, handling, analyzing and deploying any kind of referenced geographic information in order to solve complex management and planning problems.