Reporting

• JFreeChart is a free 100% Java chart library that makes it easy for developers to display professional quality charts in their applications. JFreeChart's extensive feature set includes:

http://www.jfree.org/jfreechart/

• BIRT is an open source Eclipse-based reporting system that integrates with your Java/Java EE application to produce compelling reports.

http://www.eclipse.org/birt/phoenix/

• The JasperReports Library is the world's most popular open source reporting engine. It is entirely written in Java and it is able to use data coming from any kind of data source and produce pixel-perfect documents that can be viewed, printed or exported in a variety of document formats including HTML, PDF, Excel, OpenOffice and Word.

http://community.jaspersoft.com/project/jasperreports-library

• Open Source Charting & Reporting Tools in Java

http://java-source.net/open-source/charting-and-reporting

• Google Charts

https://developers.google.com/chart

• Jaspersoft Studio is the new Eclipse-based report designer for JasperReports and JasperReports Server.

It is a full rewrite of iReport Designer, available as Eclipse plugin, and as a standalone application
http://community.jaspersoft.com/project/jaspersoft-studio