There's a library to help you get started with ios.

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Can generate charts such as histograms, graphs, pie charts, and so on data.
Charges or free are available, preferably open source.

There's a good recommendation.

4 Answers

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There's a jfree, which can be used to do the server.
If you don't mind, you can use or highcharts.

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Open source free:

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