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I rarely have a need to display static charts. My common use when I reach for a chart is to display live streaming data. Usually doing so involves accessing a points list directly and managing the addition/deletion/updating myself.

Is there any chart system that is made with live updating in mind?

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Yes, rickshaw.js: http://code.shutterstock.com/rickshaw/

And it's built on top of d3, so the possibilities for customization are almost limitless (as another commenter has said).

http://fastly.github.io/epoch/ is built for real-time streaming data. It also uses d3

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