This was a collection of tools for network mapping. It is designed specially for situations where there is a single central node, and a set of branches off of it which can each have various properties (typically size and color).
The subdirectory 'networkx-d3-v2' contains the code that uses D3 to visualise the network graph.
A live example of an earlier version of this code was used by Al-Jazeera to track defections from the Syrian regmine to the revolutionary opposition that started in 2009 was available here: http://www.aljazeera.com/indepth/interactive/syriadefections/
The site is no longer live, and the code stopped being runnable a few years ago. If you want to find more information, you can look in the github history. Maybe one day the concept will be rewritten.