Over on Alphaworks, IBM has released a Web Ontology Manager:
IBM Web Ontology Manager is a lightweight, Web-based tool for managing ontologies expressed in Web Ontology Language (OWL). With this technology, users can browse, search, and submit ontologies to an ontology repository. Developers can discover new ontologies without having to develop the ontology themselves; reusability is thereby promoted and development time and effort is reduced. This technology includes a Web interface for easy uploading of ontologies in an .owl format by any user of the system. It also includes an interface for generating (using Jastor) Java APIs from uploaded ontology files.