Knoodl
Knoodl is a web-based, collaborative ontology editor. Each resource in an ontology has its own web-page which is half structured content from the ontology and half unstructured content in the form of wikitext. Content in Knoodl is organized into Communites, which can be created by any user. Communities have a role-based permissions model. Ontologies can be imported and exported as OWL files, with or without the associated wikitext.
All Knoodl functionality is exposed as Java Beans so users can write their own semantic applications by writing Java Server Pages and Java Script. Future releases will support ontology guided search and a rich application development framework which will give users the ability to design custom forms for entering data or queries and custom views for displaying data.
Knoodl is written in Java. It's underlying RDF store is Mulgara. It is a free, publicly hosted site but can be licensed to run behind a firewall.
