Plotly - Low-Code Data Apps
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.
KoolChart - Koolcharts provides charting solutions with full HTML5 support.
Image Charts - No more pain rendering charts server-side.