Chart.js - Easy, object oriented client side graphs for designers and developers.
amCharts - Advanced javascript charting library that will suit any data visualization need
D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
Warp 10 - Ease the daily management and analysis of sensor data.
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
Quickmetrics - Here you'll find some handy helpers to send events to Quickmetrics. - Quickmetrics