I use QGIS 2.8 downloadable at qgis.org. It is a free open source GIS software that is best suited for cartography. I personnaly use QGIS, GRASS GIS and GIMP to make fantasy maps. I combine those three softwares to make fantasy mapping, QGIS and GRASS for geographical information and GIMP for graphical finishing touches. If you are new to GIS softwares, there are a lot of tutorials available with a simple google search. Hope this can help someone.