OpenOffice.org is the open source project through which Sun Microsystems is releasing the technology for the popular StarOffice productivity suite. It is an international office suite that will run on all major platforms and provide access to all functionality and data through open-component based APIs and an XML-based file format. It establishes the necessary facilities to make this open source technology available to the developer community.

HomePage : http://openoffice.org/
Download: OpenOffice.org 2.0.4 RC2  Windows
Download: OpenOffice.org 2.0.4 RC2  Linux