You can download and use all amCharts products for free. The only limitation of the free version is that a small link to this web site will be displayed in the top left corner of your charts. If you would like to use charts without this link, or you appreciate the software and would like to support its creators, please purchase a commercial license

For more info please check out Documentation

Bar Chart With custom colors.
Duration on Value Axis
Bar and line chart mix
Line With Changing Color