This is a graph showing a set of StackOverflow topics, and Packt content, and relations between them all. The data comes from a Neo4j instance we use internally at Packt. the connections are generated algorithmically using Python, and the visualisation is built with Linkurious.js (which is built on the awesome Sigma.js).
This graph has been put together for Packt's Python Week.For more information on how all this was put together, read this blog
Be sure to have a look around and explore the individual nodes... you may find a few discounts among them!