QGIS is a professional GIS application that is built on top of and proud to be itself Free and Open Source Software (FOSS).
"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. "
QGIS is installed in the Shideler Hall GIS computer labs (SHD 132, SHD 134)
The QGIS web page is your best place to start!
QGIS is used on GEO 242 Mapping a Changing World if you are interested in learning in a classroom setting.
There are many online resources for self-guided learning. Below are some of those resources: