A Centre of Excellence can only be sustainable when the needs of its users are addressed in an adequate way. For EXCELLERAT this user base, comprises its community which many times has a dual role of knowledge carrier and solution provider at the same time. Members of this community are researchers, engineers, computer scientists and technologists, coming from both industry and academia, who all share the same passion for development of innovative, powerful HPC solutions for engineering. In particular, EXCELLERAT addresses the needs of the following audiences: