Hi, author here. Plotly was the biggest surprise for me when I was writing the two blog posts, and I definitely want to try out plotly.js as well. Could take a few weeks, though :) Go ahead and recreate that chart yourself! I already had John Muyskens from the Washington Post Graphics team add the brand news Python Leather library to the repo: https://github.com/OpenNewsLabs/onechart-twelvechartinglibra...

Agreed, when I looked at every JS plotting library that I could find about a year ago, those two were far and above the winners for open- and closed-source, respectively. Now plotly is free and open source and seems unmatched in its abilities.

The author also had the same experience that I had with the "reusable" libraries built on d3: none of them really work that well either because of bugs or their inflexible interface.