Do-it-yourself GIS: 20 free tools & data sources for creating data maps

(21 August 2013) The world of mapping and presenting data sets through geographical representations is no longer relegated to GIS librarians and highly trained technologists. New free and open source applications now make it possible to create complex and robust data visualizations in the form of maps that display statistics and poll results. Ellyssa Kroski guides would-be cartographers  to 20 free applications and data sources here.