QuickChart - QuickChart is easy to use and open-source open API that makes it easy to generate chart images.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Visualis - Use Visual.is to create beautiful and dynamic reports, charts and dashboards.
liveGap Charts - Free online charts. Easily create animated charts from your data.save your charts as image or HTML.
Chartworks - Chartworks allows you to work with complex financial data and provides chart technology across images, HTML5, and iOS.
Plotly - Low-Code Data Apps