Open source Graph library [closed]

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I am looking for any open source/free graph(charting) library in C/C++ or C#. Just like free JfreeChart in java. Does anyone know it?

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I'm a big fan of gnuplot... It's open-source and very versatile.

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You can try Microsoft Chart Controls for Microsoft .NET Framework 3.5 for .Net. Samples are also available.

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Take a look at MathGL

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DynamicDataDisplay for C# is free and a quite efficient way of charting data. It supports quick pans and zooms.