RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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A nested Donut chart

[No canvas support]

This is an example of the new (in version 5.28) RGraph.Activity class. (You can read the documentation page for the Activity meter here. Previously to get this sort of chart a large amount of custom code was necessary but now the chart has been given its own class - which is in the RGraph.activity.js file.

The colors and quantity of the rings are specified by you and the icons are configurable (or can be replaced with text if you prefer. The chart can be animated using the grow effect, adjusted and can now also have tooltips.

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.activity.js"></script>
Put this where you want the chart to show up:
<div style="float: right; display: inline-block">
    <canvas id="cvs" width="450" height="450" style="background-color: black;">[No canvas support]</canvas>
This is the code that generates the chart - it should be placed AFTER the canvas tag(s):
    activity = new RGraph.Activity({
        id: 'cvs',
        min: 0,
        max: 100,
        value: [67,57,46],
        options: {
            icons: [
            width: 50,
            marginTop: 5,
            marginBottom: 5,
            marginLeft: 5,
            marginRight: 5,
            responsive: [
                {maxWidth: null, width: 350, height: 350, options: {width: null}, parentCss: {'float':'right', textAlign:'none',width:''}},
                {maxWidth: 750,  width: 250, height: 250, options: {width: 25}, parentCss: {'float':'none', textAlign:'center',width:'100%'}}