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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Did anyone use this with Arduino to make a gauge meter for temperature sensing, as an example, and a ESP8266 so that we can work offline ? Is there a tutorial how to get me started ?

I've never done that or used such a 'thing' - but maybe this might help:

var value = 80; // <-- Change this 80 to be the value that you want to see on the Gauge

new RGraph.Gauge({
    id: 'cvs',
    min: 0,
    max: 100,
    value: value,
    options: {
    }
}).draw();

HTH