Librerias Charts

https://github.com/globocom/megadraft-chart-plugin/issues/1

https://www.campusmvp.es/recursos/post/5-bibliotecas-javascript-para-creacion-de-graficas-y-visualizaciones.aspx

...you should replace Highcharts with a real Free Software/Open Source project, such as:

• Plotly.js (MIT license)
• Chart.js (MIT license)
• D3.js (Modified BSD license)
• Vega (Modified BSD license)
• Taucharts (Apache license 2.0)
• jqPlot's (MIT license)
• etc