OpenOffice is a multi-platform office productivity suite. It includes the key desktop applications, such as a word processor, spreadsheet, presentation manager, and drawing program, with a user interface and feature set similar to other office suites. Sophisticated and flexible, OpenOffice also works transparently with a variety of file formats, including those of Microsoft Office. OpenOffice also has the built-in ability to create .pdf files.
For additional information, please refer to: OpenOffice: LSU Overview.