QGIS is an open source, freely downloadable and distributable professional desktop GIS package. It has an active developer and user community. It’s robust, well-supported and integrates extremely well with other open source tools such as PostGreSQL/PostGIS and GeoServer. As such it is a valuable component of your Spatial Data Infrastructure
QGIS handles all standard GIS formats such as shapefile, KML and MapInfo TAB file, GeoPackage as well as many less well-used ones.