[alpatters]

I'm surprised they do not reference GraphLab from Carnegie Mellon, http://graphlab.org/projects/index.html It's built for the same purpose and has been around for a number of years. The core is in C++ with python bindings. It has quite a few ready made applications built on top of it as well.

[espeed]

They reference GraphX (http://amplab.github.io/graphx/). GraphX is essentially GraphLab built on Spark, and the GraphX project lead is Joey Gonzalez (https://amplab.cs.berkeley.edu/author/jegonzal/), the creator of GraphLab.