You can use any chart plugin with Ace but I've mostly used Chart.js which is fast and has many features.
There some examples in Dashboard, Dashboard 2, Dashboard 3 and Charts page.
You can find them here:
views/pages/dashboard/@page-script.js
views/pages/dashboard-2/@page-script.js
views/pages/dashboard-3/@page-script.js
views/pages/dashboard-4/@page-script.js
views/pages/charts/@page-script.js
Some bar charts in demo have rounded corners which is not available by default in this plugin.
The extra code to enable this is inside
The extra code to enable this is inside
app/browser/demo.js. Search for Rounded Rectangle Extension
Other plugins are included as an example and shown in Charts page. For exmple Chartist , Flotchart and Google Charts