Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
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.
Processing - C++ and Java programming at the speed of thought.
Chart.js - Easy, object oriented client side graphs for designers and developers.
Vuo - Design and build live interactive media.
Google Charts - Interactive charts for browsers and mobile devices.