Gauges, Bar Graphs, Pie Charts, you name it. Ever developer needs to output a graphical depiction of data at some time, and there's no point in recreating the wheel. Use one of these free controls as a starting point to save time and money.
My Bar Graphs to Go article showcases a good starting point for creating a simple, extremely lightweight graphing control. It uses pure HTML and relies on no images, Flash, or other potentially sluggish chokepoints. Not only is the source code free, but I've written an entire article about it to help you understand it deeply.
http://SteveOrr.net/articles/BarGraphs.aspx
ZedGraph is a free charting library that is both feature rich and easy to use. Its C# codebase can output a variety of different chart types. Download this open source library now to discover first hand what it has to offer.
Carlos Aguilar Mares has done it again. Another top notch control under his belt in the form of WebChart. This free control can output 8 different kinds of reasonably attractive charts. It features first rate Visual Studio designer support.
http://www.carlosag.net/Tools/WebChart/
In case free just doesn't seem to meet your requirements, you may want to look into these excellent (but not free) 3rd party charting controls:
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