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QGIS

QGIS is a free, open-source geographic information system (GIS) software for viewing, editing, analyzing, and sharing geospatial data across raster, vector, mesh, and point cloud layers on Windows, macOS, and Linux.​Key features include on-the-fly reprojection, geoprocessing tools (buffers, queries), GRASS integration, print layouts with atlases, Python/C++ plugins, DB Manager for PostGIS/SQLite, and exports like shapefiles, GeoTIFF, and KML.