QGIS

QGIS is a free, open-source geographic information system for creating, editing, visualizing, analyzing, and sharing geospatial data. It reads and writes common vector and raster formats, connects to spatial databases such as PostGIS and SpatiaLite, and consumes web services including WMS, WFS, WMTS, and XYZ tiles. The Processing toolbox integrates algorithms from GDAL/OGR, GRASS GIS, SAGA, and others, enabling robust geoprocessing and spatial analysis.

QGIS offers advanced cartography features—rule-based symbology, dynamic labeling, and print layouts with atlas generation—alongside attribute editing, a field calculator, topology checks, and 3D and time-enabled views. It is extensible through a rich plugin ecosystem and a Python API (PyQGIS) for automation and customization. Cross-platform support covers Windows, macOS, and Linux, and the software is released under the GNU GPL. QGIS serves professionals, researchers, and learners across domains like urban planning, environmental management, conservation, and public health, with outputs exportable to PDF, SVG, and image formats or publishable via QGIS Server.