Java Graph/Chart libraries?

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Hi,

Does anyone know any good (free) Java chart libraries. I've had a look on the internet but there seem to be either all commercial, or look horrendous.
I'm after something that looks quite good. These look amazing, but look at the cost!... http://www.objectplanet.com/easycharts/

Thanks,
Alex

 

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They're just the evaluation libraries which include a huge watermark over everything