Annotations are very important for presenting data visualizations. ChartAccent is a tool for annotating charts. This visual enables you to create line charts with rich annotations by a few clicks. You can highlight individual data points, a data series, points with a range, or even points above the average value.
To learn more about ChartAccent, visit https://chartaccent.github.io/. ChartAccent is an open source project at https://github.com/chartaccent/chartaccent