QuickChart - QuickChart is easy to use and open-source open API that makes it easy to generate chart images.
Plotly - Low-Code Data Apps
Chartworks - Chartworks allows you to work with complex financial data and provides chart technology across images, HTML5, and iOS.
Visualis - Use Visual.is to create beautiful and dynamic reports, charts and dashboards.
Google Charts - Interactive charts for browsers and mobile devices.
KoolChart - Koolcharts provides charting solutions with full HTML5 support.