The best replacement for highcharts is d3.

The best alternatives to highcharts are rated as following:
★★★★★  d3
★★★★  highstock
★★★★  flot
★★★★  fusioncharts
★★★  amcharts
★★★  google chart
★★★  chartjs
★★  nvd3
★★  rickshaw
★★  jqplot
★  dojo charts
★  google visualization
  kendo ui
  d3.js

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Google Trends

Scale is based on the average worldwide traffic of highcharts in all years. Click on graph for more.
highcharts
d3
highstock