Knoodl facilitates community-oriented development of OWL based ontologies and RDF knowledgebases. It also serves as a semantic technology platform, offering a JAVA service-based interface or a SPARQL-based interface so that communities can build their own semantic applications using their ontologies and knowledgebases. Knoodl is a product of Revelytix and is hosted in the Amazon EC2 cloud and is available for free. It can also be licensed for private use.