I need a tool for creating high quality customizable pie charts, then export them to some graphic format (e.g. png).
I need something which allows me to put in some data and which is more customizable than OpenOffice.org.
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Not exactly what you asked for, but this may work anyways. Link is to a pie chart wizard.
graphviz, optionally with one of its GUI wrappers should be able to do anything you need.
The R language can be used to create bar and pie chart graphs. An example extracted from their help page:
> d <- read.table("data/EU-2004.csv", header=TRUE) # read data > pie(d$seats, # create pie chart with seats column + labels=d$abbrev, # use abbrev column for slice labels + main="2004 EU Parliament Results\n(Seats by Party)") # create pie chart
Later, they have an example where this sort of output is sent to a jpeg. I didn't see PNG output. It may be available, but worst case, a jpeg can easily be converted to a PNG.