The Atlantic&#x27;s Quartz website has open-sourced a simple D3-based charting program called Chartbuilder. It&#x27;s not as full-featured as Highcharts, but it&#x27;s free at any usage level and customizable.<p>Code: <a href="https:&#x2F;&#x2F;github.com&#x2F;Quartz&#x2F;Chartbuilder" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Quartz&#x2F;Chartbuilder</a><p>Try it: <a href="https:&#x2F;&#x2F;quartz.github.io&#x2F;Chartbuilder&#x2F;" rel="nofollow">https:&#x2F;&#x2F;quartz.github.io&#x2F;Chartbuilder&#x2F;</a>