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
and vector data formats, with new support easily added using the plugin
architecture.

Homepage:
https://www.qgis.org/
