QGIS is a free and open source Geographic Information System application for Windows, MacOS, Android and Linux. It is released under the GNU General Public License. In QGIS you can view combinations of vector and raster data in different formats. It supports PostGIS, SpatiaLite and MS SQL Spatial, Oracle Spatial,GeoPackage, ESRI Shapefile, MapInfo, SDTS, GML, GeoTIFF, ERDAS IMG, ArcInfo ASCII GRID, JPEG, PNG, WMS, WMTS, WCS, WFS, and WFS-T and ODS, XLSX. It also comes with plugin support to extend its features.