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JasperReports Library is the world's most popular open source business intelligence and 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.
The project is also available at:
https://github.com/TIBCOSoftware/jasperreports
Jaspersoft Studio is the open source report designer for the JasperReports Library.
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Java API for reports and crosstab reports (or pivot tables ) with groupings, subtotals, data aggregation. Simple, fast and easy way to construct reports in various formats : HTML, XML, Excel, PDF, SVG.
The reports can be used programatically or configured using spring framework (declaratively).
Java class library for generating reports. XML-based templates provide flexible reporting and printing functionality using data from multiple sources and supports output to display devices, printers, PDF, Excel, HTML, XHTML, PlainText, XML and CSV files.
The JDBReport Generator is the small and fast generator of reports, including a viewer, implemented in 100% Pure Java. Reports can be exported to HTML, Open Document Format (ODT, ODS), PDF, Excel 2003, Excel 2007
JDBReport Designer is a simple and powerful reports template editor. It can help you quickly create the required report, generate and print it or export to another format (HTML, Open Document Format (ODT, ODS), PDF, Excel 2003, Excel 2007).
JCopist is a template-based document generation server based on OpenOffice.org.
Its templates are regular OpenDocuments enhanced with the FreeMarker scripting language.
A wide range of formats are available, eg. : ODT, PDF, RTF, HTML, MS Word, MS Excel