Surprised no one has mentioned Emprise yet. http://ejschart.com/ http://ejschart.com/ Their website is not the nicest but their charts are very good, also pure

Surprised no one has mentioned Emprise yet. http://ejschart.com/ http://ejschart.com/ Their website is not the nicest but their charts are very good, also pure Javascript, and their pricing is reasonable. We've used the library with success in a couple of projects.