Chart Writer is part of the Reports section and allows you to create charts from your Scorecard and Initiative data that look like this:
Creating a Chart
Creating a chart is the same as creating any other report in the Reports section. Just click the New Report button and choose Chart Writer.
From here, you'll want to configure your chart to show the data you want. This is the same process as configuring charts in the Dashboards section, and both are covered in the Customizing Charts article.