From the webpage:
Knoodl is a tool for creating, managing, and analyzing RDF/OWL descriptions. Its many features support collaboration in all stages of these activities. Knoodl’s key component is a semantic software architecture that supports Emergent Analytics. Knoodl is hosted in the Amazon EC2 cloud and can be used for free. It may also be licensed for private use as MyKnoodl.
Mapping to or between the components of RDF/OWL descriptions as subjects will require analysis. Or simply use of RDF/OWL descriptions. In either case this could be a useful tool.