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.
232key - Transforms data received via RS-232 into keystrokes. Make your serial device talk to any program!
Chart.js - Easy, object oriented client side graphs for designers and developers.
TWedge - TWedge enables you to capture data from devices like bar code readers, scanners, decoders, gauges...
Google Charts - Interactive charts for browsers and mobile devices.
NoFlo - NoFlo is a JavaScript implementation of Flow-Based Programming (FBP).