A list of WMS available catalogs is available at

http://www.pcn.minambiente.it/PCNDYN/catalogowms.jsp?lan=it

Each URI can be used to access a layer and download data possibly by any WMS client (e.g. Qgis). It is convenient using the GRASS module r.in.wms to download tiles and convert them in rasters within one of the supported location. So, for instance from a UTM/WGS84/33 location one can issue a command like:

r.in.wms -c mapserver="http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/service/ortofoto_colore_06_f33.map" \
output=ortofoto layers="ortofoto_colore_06" format="png" srs="EPSG:32633" 

to get an ortophoto of 2006 in the current computational region.