QuickChart - QuickChart is easy to use and open-source open API that makes it easy to generate chart images.
Google Charts - Interactive charts for browsers and mobile devices.
Visualis - Use Visual.is to create beautiful and dynamic reports, charts and dashboards.
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
Chartworks - Chartworks allows you to work with complex financial data and provides chart technology across images, HTML5, and iOS.
ChartURL - Add rich, data-driven charts to web & mobile apps, Slack bots, and emails. Send us data, and we return an image that renders perfectly on all platforms.