On this page you can find bi-directional mappings between OBO ontologies and from OBO ontologies to other ontologies (or controlled vocabularies) that are critical to the biomedical research community. Useful for the integration of data.
Just one tool listed here now--OBO-Edit, a graphical tool for creating and updating ontologies. More tools are coming soon.
A compendium of relevant publications that mention the OBO Foundry.
The OBO Foundry uses SourceForge to manage this project. This is a link to the SourceForge project page for OBO.