The ODF-XSLT Document Generator is a library written in PHP 5 that brings the full power of XSLT to your OpenDocument files. It enables you to use ODF files as if they were plain XSLT templates. It also includes a few extra parsing options that allow you to edit the XSLT parts of these ODF from within your favourite office suite. ODF-XSLT is developed by Tribal Internet Marketing and is released as Free Software under the GNU General Public License, version 3.

With ODFDiff you can compare text documents, spreadsheets and presentations in a fast and accurate way. Differences are presented as tracked changes, except for presentations, which don't support that feature. It comes as an OpenOffice extension as well as a stand-alone program.

Odfpy aims to be a complete API for OpenDocument in Python, essentially an abstraction layer just above the XML format. The main focus is to prevent the programmer from creating invalid documents.

The OpenOffice extension ODFToEPub lets you save a document in the ePub format, which is used on many e-readers. As a consequence, documents written with other word processors can also easily be converted to an e-book. It also comes as a stand-alone program and as a library for batch operations.

odsPhpGenerator is a library writen in PHP 5.0 for generating ODF Spreadsheets (.ods)

odt2braille is a Braille extension to OpenOffice.org Writer. odt2braille will enable authors to print documents to a Braille embosser and to export documents as Braille files. The Braille output is well-formatted and highly customizable.

Commercial online ODT to ePUB (e-book) conversion service.

An object oriented PHP5 library that generates ODF text documents from templates.

Office-o-tron is an online validator for office documents. It understands ODF (1.0, 1.1 and draft 1.2) and OOXML ("Transitional").

Open source viewer for Symbian phones, supporting ODF text (.odt), spreadsheets (.ods) and presentations (.odp)

The project is sponsored by the NLNet Foundation and Odendahl-SEPT.