Having asked this same exact question before my answers, as some have mentioned below, are RaphaelJs and JqPlot. That said I am also looking into D3 which is al

Having asked this same exact question before my answers, as some have mentioned below, are RaphaelJs and JqPlot. That said I am also looking into D3 which is also mentioned below. RaphaelJs has a number of controls based on it such as JustGage animated gauges(not by me but I have used it), and JqPlot which is highly configurable and seems to "just work".