SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
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.
DPlot - DPlot graphing software lets scientists and engineers graph, plot, analyze, and manipulate data.
Chart.js - Easy, object oriented client side graphs for designers and developers.
WinPython - The easiest way to run Python, Spyder with SciPy and friends out of the box on any Windows PC...
Google Charts - Interactive charts for browsers and mobile devices.