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Online chart maker for CSV and Excel data; make charts and dashboards online. One really nice feature is that charts made this way get permalinks, and can be easily inlined as PNGs or HTML5 divs. (See https://www.vividcortex.com/blog/analyzing-sparks-mpp-scalability-with-the-usl for an example.)
(tags: data javascript python tools visualization dataviz charts graphing web plotly plots graphs)