I chose an open source software developed by INRIA and LaBRI called “Tulip”. Tulip is a data visualization tool. It models the relationships between the nodes and analyzes the connections between them. Tulip contains a library of algorithms that can be applied to the data set and model them into graphs. The interactions between the nodes can be analyzed and the data associated to them can be filtered or grouped. The nodes can also be clustered into macro nodes if they share the same data properties.
You may download Tulip from http://tulip.labri.fr/TulipDrupal/