Open Source HTML5 charts library. NextCharts was developed to be used by Open Source NextReports Reporting&BI suite (www.next-reports.com).
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Pro Great diversity
Besides having all consecrated charts like line, area, bar, horizontal bar, pie, bubble , it can have styles for line dots (solid dot, hollow dot, star, bow, anchor) or bar types (like dome, cylinder, parallelepiped). It has support for stacked bars, negative bars, combo bar-line charts, dual axis, click events and tooltips.
Completely free and open-source as it uses the Apache license.