from Peter Suber:
The OASIS OpenDocument Format (ODF) has been approved as ISO/IEC 26300. ODF is an XML-based, Open Source file specification for the storage of files produced by office productivity applications (word processor documents, spreadsheets, presentations, drawings, etc.). ODF is already fully supported by the OpenOffice.org productivity suite, an Open Source software bundle issued under the GNU Lesser General Public License (GNU LGPL). OpenOffice.org editions are available in 65 languages and may be run on Windows (98/ME/NT/2000/XP), Mac OS, Linux, and Solaris, among other operating systems, even Windows 95. OpenOffice.org software can read and write to the proprietary document storage formats employed in the Microsoft Office suite.