1. QGIS
Supported OS: Windows, Mac OS 10, Linux
Number one on our list of 7 easiest free GIS software is famous QGIS. It is one of most widely used cross platform open source GIS software that enables many options for managing geospatial data. Cross-platforming enables integration with other open source GIS software such as GRASS GIS, Map Server and Post GIS. It is constantly being improved with bugs being fixed and updates and new plug-ins released. It can be used in a variety of fields that concern spatial information thanks to the great number of tools and options.
