Ontology Editing

Brought to my attention.  We worked with Stanford Knowledge Systems Lab in the past. They have made some progress since then

WebProtégé is an ontology development environment for the Web that makes it easy to create, upload, modify, and share ontologies for collaborative viewing and editing.

WebProtégé fully supports the latest OWL 2 Web Ontology Language. The highly configurable user interface creates the perfect environment for beginners and experts alike. Collaboration features abound, including sharing and permissions, threaded notes and discussions, watches and email notifications. RDF/XML, Turtle, OWL/XML, OBO, and other formats available for ontology upload and download.   .... " 

Protoge
A free, open-source ontology editor and framework for building intelligent systems

Protégé is supported by a strong community of academic, government, and corporate users, who use Protégé to build knowledge-based solutions in areas as diverse as biomedicine, e-commerce, and organizational modeling. .... "