LibreOffice is a productivity suite that is compatible with other major office suites, and available on a variety of platforms.

http://lpod-project.org

LyX is an open source document processor running on Windows, Linux and MacOS X. Unlike standard word processors, LyX encourages an approach to writing based on the structure of documents, instead of their appearance. Export to ODF is done by using configurable converters.

Service pack 2 adds support for opening and saving ODF files in MS-Office Excel, PowerPoint and Word 2007.

Mobile Office is an Office suite for Symbian smartphones.

You can now read (and later on edit and create) your files also on your mobile and have them always with you on the road without the need to convert them to other formats as well as compromising on formating and ODF features.

Nuxeo 5 is the leading open source ECM platform. It enables companies and organizations to manage all their documents thoughout their full lifecycle, ensuring collaboration among people, business process efficiency and accountability.

Nuxeo 5 natively supports the OpenDocument Format. Data and metadata are extracted from the documents to provide high-level services, including: full-text indexing and searching, classification, data consolidation, etc.

O3Spaces extends OpenOffice.org & StarOffice with an integrated solution for document centric collaboration for all kinds of organizations. O3Spaces provides OpenOffice.org & StarOffice users with a professional out-of-the-box extension for teamwork and collaboration.

OCRFeeder is a document layout analysis and OCR system.

It will automatically outline content, distinguish between graphics and text and perform OCR. It generates multiple formats, its main one being ODT.

Tools for converting ODF to PO and XLIFF Translation files, the project is supported by NLNet Foundation and Itaapy.

Written in Ruby, ODF-Report generates .odt files by replacing placeholders in templates.