Data visualization (e.g. charts) tools

JS libraries:

• d3
• sigmajs

Widgets & Components:

• Chart.js
• C3.js
• Google Charts
• chartist-jsj
• amCharts [$]
• Highcharts [Non-commercial free to $]
• FusionCharts [$]
• ZingChart [free to $]
• Epoch

Services:

• Datawrapper
• infogr.am [free to $]
• plotly [free to $]
• ChartBlocks [free to $]