QGIS is a user friendly Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities.
Our latest release is QGIS 2.2
QGIS provides a continously grow-fluiding number of capabilities provided by core functions and plugins. You can visualize, manage, edit, analyse data, and compose printable maps. Get a first impression with a more detailed feature list.
Community-contributed screenshots of QGIS to help provide a quick overview:
The QGIS community has collected a number of case studies of how users around the world are using QGIS for their GIS work.
QGIS is a volunteer driven project. We welcome contributions in the form of code contributions, bug fixes, bug reports, contributed documentation, advocacy and supporting other users on our mailing lists and gis.stackexchange.com. If you are interested in actively supporting the project, you can find more information under the development menu and on the QGIS Wiki. We also welcome financial contributions in the form of sponsoring and funding.
Do you plan to use QGIS in your company or organization, but worry about whether there is commercial support available? Here is an alphabetical list, divided in categories, of support contractors.