Since July 6, 2007 Protégé3.3 is out (and not beta anymore). Besides bug fixes and other improvements two very nice features were added: Collaborative Protégé and the DataMaster plug-in.

• Collaborative Protégé: a new extension of the existing Protégé system that supports collaborative ontology editing. In addition to the common ontology editing operations, users can annotate both ontology components and ontology changes. There is support for searching and filtering of user annotations based on a variety of different criteria. Two types of voting mechanisms have been implemented to allow users to vote on change proposals. Collaborative Protégé can be used with the Protégé-OWL editor, the Protégé-Frames editor, and client-server Protégé. Please note that Collaborative Protégé is still considered a prototype that is under active development. Your feedback is most welcome! An installation guide, a user’s guide, an online demo, and more documentation are available on a separate Web page.
• DataMaster: a new plug-in that allows users to import schema structure and data from relational databases into Protégé. DataMaster is documented on the Protégé Wiki.

Check out the release notes.