There's a nice suggestion in this answers thread: https://answers.atlassian.com/questions/74727. It will present you with different options, such as the following:
You can try https://www.jirareports.com. It is a cloud based tool that allows creation of free form reports for OnDemand and hosted Jira instances. It offers different types of reports such as bar chart, matrix reports etc. and has a rich set of features available, such as publishing the reports, calculated fields and export capabilities.
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