Plotly - Low-Code Data Apps
PykCharts.js - Well designed d3.js charting without the complexity of d3.js
RAWGraphs - RAWGraphs is an open source app built with the goal of making the visualization of complex data...
CanvasJS - HTML5 JavaScript, jQuery, Angular, React Charts for Data Visualization
ChartBlocks - Import data, design and share a chart in minutes. Or seconds via the API.
NVD3 - This project is an attempt to build re-usable charts and chart components for d3.