JODConverter, the Java OpenDocument Converter, converts documents between different office formats.
It leverages OpenOffice.org, which provides arguably the best import/export filters for OpenDocument and Microsoft Office formats available today.

Automates conversions between office document formats using OpenOffice.org. Supported formats include OpenDocument, PDF, RTF, HTML, Word, Excel, PowerPoint, and Flash.
It can be used as a Java library, a command line tool, or a web application.

JODConverter automates all conversions supported by OpenOffice.org, including
1. Microsoft Office to OpenDocument, and viceversa
* Word to OpenDocument Text (odt); OpenDocument Text (odt) to Word
* Excel to OpenDocument Spreadsheet (ods); OpenDocument Spreadsheet (ods) to Excel
* PowerPoint to OpenDocument Presentation (odp); OpenDocument Presentation (odp) to PowerPoint
2. Any format to PDF
* OpenDocument (Text, Spreadsheet, Presentation) to PDF
* Word to PDF; Excel to PDF; PowerPoint to PDF
* RTF to PDF; WordPerfect to PDF; ...
3. And more
* OpenDocument Presentation (odp) to Flash; PowerPoint to Flash
* RTF to OpenDocument; WordPerfect to OpenDocument
* Any format to HTML (with limitations)
* Support for OpenOffice.org 1.0 and old StarOffice formats

JODConverter can be used in many different ways
* As a Java library, embedded in your own Java application
* As a command line tool, possibly invoked from your own scripts
* As a simple web application: upload your input document, select the desired format and download the converted version
* As a web service, invoked from your own software written in your favourite language (.NET, PHP, Python, Ruby, ...)

Requirements:
* Java 1.5 or later
* OpenOffice.org 3.0.0 or later

JODConverter automates conversions that are actually performed by OpenOffice.org. This means that if you can convert from format ABC to format XYZ from OpenOffice.org (by opening ABC and saving/exporting to XYZ) then you can do the same with JODConverter. You just have to discover the magic string used by OpenOffice.org as the export filter name. A useful list can be found in the OpenOffice.org Wiki.

That said, JODConverter maintains a registry of the most common formats, their associated file extensions, mime types, and OpenOffice.org filter names to simplify your life. These predefined conversions are shown in the following table:
Text Formats:
* OpenDocument Text (*.odt)
* OpenOffice.org 1.0 Text (*.sxw)
* Rich Text Format (*.rtf)
* Microsoft Word (*.doc)
* WordPerfect (*.wpd)
* Plain Text (*.txt)
* HTML [1] (*.html)
* Portable Document Format (*.pdf)
* OpenDocument Text (*.odt)
* OpenOffice.org 1.0 Text (*.sxw)
* Rich Text Format (*.rtf)
* Microsoft Word (*.doc)
* Plain Text (*.txt)
* HTML [2] (*.html)
* MediaWiki wikitext (*.wiki)

Spreadsheet Formats:
* OpenDocument Spreadsheet (*.ods)
* OpenOffice.org 1.0 Spreadsheet (*.sxc)
* Microsoft Excel (*.xls)
* Comma-Separated Values (*.csv)
* Tab-Separated Values (*.tsv)
* Portable Document Format (*.pdf)
* OpenDocument Spreadsheet (*.ods)
* OpenOffice.org 1.0 Spreadsheet (*.sxc)
* Microsoft Excel (*.xls)
* Comma-Separated Values (*.csv)
* Tab-Separated Values (*.tsv)
* HTML [2] (*.html)

Presentation Formats
* OpenDocument Presentation (*.odp)
* OpenOffice.org 1.0 Presentation (*.sxi)
* Microsoft PowerPoint (*.ppt)
* Portable Document Format (*.pdf)
* Macromedia Flash (*.swf)
* OpenDocument Presentation (*.odp)
* OpenOffice.org 1.0 Presentation (*.sxi)
* Microsoft PowerPoint (*.ppt)
* HTML [2] (*.html)

Drawing Formats
* OpenDocument Drawing (*.odg)
* Scalable Vector Graphics (*.svg)
* Macromedia Flash (*.swf)

[1] HTML can be used as an input format but you should not expect OpenOffice.org to properly render complex web pages as Firefox or IE7 do. Works reasonably well for simple and "printer friendly" web pages only.
[2] HTML can be used as an output format but while all other formats always generate a single output file, HTML can produce multiple files. In addition to the HTML file in fact, any images contained in the input document will also be saved in the same directory. This requires extra care in your code, especially in a web environment.

The license of this software is Freeware, you can free download and free use this office suite software.