Python: Matplot lib

I've talked about Matplotlib before. It's a great plotting library because it has a lot of backends. You can not only output to PNG, SVG, PS, etc. but to various user interfaces like wxPython. The Antigrain rendering backend is particularly nice since it does a better than usual job of anti-aliasing. Now it also has better font support and Unicode support. This was a problem for me since my wife had graphs with accents in them.
I recommend Matplotlib for anyone who wants to output charts even if they are not Python programmers.

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