Web Charting Program Libraries (Free)

jQuery Charting - Stack Overflow:

jqPlot Charts and Graphs for jQuery

Examples | jqPlot

Flot: Attractive JavaScript plotting for jQuery

jQuery Sparklines

gRaphaël—Charting JavaScript Library

filamentgroup/jQuery-Visualize
( Filament Group Lab Example From: jQuery Visualize Plugin: Accessible Charts & Graphs from Table Elements using HTML 5 Canvas )

There are using Canvas, SVG or VML for older IE browsers...
Tools like this have tendency to become commercial...