Quantum GIS (QGIS) is an open source GIS product. As such the software is constantly developing and being improved upon by the world-wide GIS community. QGIS is free and the source code is openly available for those who want to improve or customise the interrace/tools. These training materials are based in the latest stable release that was available at the time of the writing, QGIS 2.8.2

To download the latest version of the QGIS visit the offficial QGIS website http://www.qgis.org/