NEPOMUK created a set of ontologies for the Semantic Desktop. They are in use and now maintained by NEPOMUK members and the open source community under coordination of the OSCA-Foundation which was initiated by us to broaden the use of the ontologies.
click on to
- http://sourceforge.net/apps/trac/oscaf/wiki/OntologyMaintenance - this page continued by OSCAF
- http://www.oscaf.org - the organisation to be contacted for ontology maintenance