If you have a non-commercial website and you need to add charting capabilities in your website, Highcharts may suit your needs.  Highcharts is a free charting control developed purely with Javascript so that you can show interactive charts on your website.  Since its purely developed with Javascript, you don’t need any special server side technologies [...]

Ivan Lazarevic is sharing 2 different plugins for creating bar charts with jQuery & MooTools:

jqBarGraph (for jQuery)
mooBarGraph (for MooTools)

Both plugins can create simple or stacked bar charts & data to be displayed is loaded with an array.

jqBarGraph has support for animated loading of the charts however mooBarGraph offers more features like:

url bars
info boxes (interactive charts)
negative [...]

In this two-part article, we will start from the beginning by implementing the logic of the plugin as a standalone script, refactoring it into a plugin and then finally adding all the additional eye candy on top of the plugin code. In this first part, we are going to deal solely with implementing the core [...]

Visualize is a jQuery plugin which converts tables to charts & graphs using the HTML 5 canvas tag.
The usage of tables is very important the data is already formatted in a way that is accessible to users browsing the web with a screen reader or other assistive technology.

The plugin offers a very easy usage [...]

As much as I hate filling a form I love seing a chart. I don’t know why. It can show a lot of things. We use charts to see our progress, to see our income, loses, gains, this versus that, he versus me, us and them etc. It’s like when we were little kids and [...]

Ajax MGraph
Ajax MGraph is a pure XHTML/CSS graph. It is User Interactive, runs in FireFox, IE and Opera, PHP Powered and includes easy database integration.

PlotKit
PlotKit is a Chart and Graph Plotting Library for Javascript. It has support for HTML Canvas and also SVG via Adobe SVG Viewer and native browser support.