The research groups at the Scientific Computing Laboratory of the Institute of Physics Belgrade (IPB) are main users of the AEGIS CMPC SG. However, a number of collaborators of IPB's research groups are involved as well, as well as other researchers from Serbian academic community (Vinca Institute, University of Belgrade: Faculty of Physics, Faculty of Chemistry, Faculty of Physical Chemistry, Faculty of Electrical Engineering, University of Novi Sad: Faculty of Mathematics and Natural Sciences, University of Nis: Faculty of Mathematics and Natural Sciences). AEGIS CMPC SG is open to other interested researchers from the region, especially from neighboring South-East Europe countries, with which we have extensive collaboration through a number of e-Infrastructure projects, and with whom we already have scientific collaboration based on the joint use of regional Grid and HPC resources.