There are hosts of other Data Visualization and GIS platforms that are open source, or that have a free version. A few are listed here, if you want to take a deeper look.
GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is a free and open source (GIS) software suite used for geospatial data management and analysis, image processing, graphics and maps production, spatial modeling, and visualization. GRASS GIS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. It is a founding member of the Open Source Geospatial Foundation (OSGeo). GRASS can work closely together with QGIS, generally with more applications in the sciences.
Harvard WorldMap is an open source mapping platform developed to lower barriers for scholars who wish to explore, visualize, edit, and publish geospatial information. The WorldMap system attempts to fill a gap between desktop GIS which is generally light on collaboration, and web-based mapping solutions which generally don't support the inclusion of large datasets.
WorldMap enables researchers to: