I have been very impressed with ChartDirector, even though it costs $99. I'm trying to get my boss to pay for it. I've been using a trial version and am pleased with the results. I've also seen that they have great customer support.

I've also checked into a couple of very good Open Source modules:

Hope this helps!

UPDATE:

ChartDirector works great for raster (e.g. PNG) or for SVG (i.e. vector) graphics.

I'm specifically working with SVG files. To output SVG using ChartDirector call the method enableVectorOutput() after creating the chart object, then use a file name ending in '.svg' when you output the file:

$chart_obj->enableVectorOutput();

. . .

$chart_obj->makeChart('chart.svg');
[download]

I am also a happy user of GD::Graph - except when it comes to adding text: the anti-aliasing never really seems to work out very well.

The next time I need some graphs I'm planning to check out Imager, which looks very promising.

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"The Spreadsheet::WriteExcel Perl module can be used to create a cross-platform Excel binary file. Multiple worksheets can be added to a workbook and formatting can be applied to cells. Text, numbers, formulas, hyperlinks, images and charts can be written to the cells.

The file produced by this module is compatible with Excel 97, 2000, 2002, 2003 and 2007.

The module will work on the majority of Windows, UNIX and Mac platforms. Generated files are also compatible with the Linux/UNIX spreadsheet applications Gnumeric and OpenOffice.org."

There's also gnuplot.

See the examples in the documentation and also this presentation: Data Visualization with Chart::Clicker.

--
John.