jqBarGraph is jQuery plugin that gives you freedom to easily display your data as graphs. There are three types of graphs: simple, multi and stacked. All you have to do is to pass your data to this plugin.
There are a lot of settings to tune appearance of your graph, as are animation, color scheme, dimensions etc. Also, you can additionally change look and feel of graph via CSS.
jQuery Gantt Chart is a simple chart that implements gantt functionality as a jQuery plugin. Plugin uses AJAX to retrive JSON data and render them as Gantt chart with many features such as zooming or paging.