A Butterfly chart is a chart where two entities are compared side by side using scales meeting at the center. Due to its shape, the chart resembles a butterfly and hence the name. These charts are sometimes also known as Funnel or Tornado Charts though I find “butterfly” to be a better description as it allows for a greater variation in shape than a funnel or a tornado does: http://www.databison.com/butterfly-chart-excel-chart-with-dual-converging-scales/.
Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs.
Runs on Windows, Linux and Mac OS X. Gephi is open-source and free: http://gephi.org.
Google Fusion Tables (or simply Fusion Tables) is a Web service provided by Google for data management. Data is stored in multiple tables that Internet users can view and download: http://www.google.com/drive/apps.html#fusiontables.
Read MoreNodeXL is a free, open-source template for Microsoft® Excel® 2007, 2010 and 2013 that makes it easy to explore network graphs. With NodeXL, you can enter a network edge list in a worksheet, click a button and see your graph, all in the familiar environment of the Excel window.
Website: http://nodexl.codeplex.com.
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