At the moment, Galyleo uses the Google Chart library.  We plan to extend this to a large number of charting and mapping libraries.  In principle, Galyleo can use any JavaScript/HTML5 based charting, mapping, or image library.  We will be updating Galyleo to include Chart.js, Leaflet.js (for maps, including building and campus maps), OpenLayers, and cytoscape.js (for networks and graphs).