For specialized visualizations, of course, there are specialized libraries. For the more general uses I mostly wanted to provide a survey of some of the librari

For specialized visualizations, of course, there are specialized libraries. For the more general uses I mostly wanted to provide a survey of some of the libraries that are available. It's not really intended as a recommendation of one library over another. When you really look at it, all of the general charting libraries are pretty similar. I did want to stick with true open source, so no HighCharts, for example.