QGIS is a free and open-source geographic information system.

QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster , vector and mesh data formats, with new support easily added using the plugin architecture.