- CESNET [Prague]
- Cardiff University
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for REsearch And Telecommunication Experimentation for NETworked communities
- Center for Research and Advanced Studies of the National Polytechnic Institute
- Centre National de la Recherche Scientifique
- Centre for Informatics and Systems of the University of Coimbra - CISUC
- Centre of Telematics and Information Technology