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, res

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.