Bulgarian Academy of Sciences: Board, central administration and research units.
Bulgarian Ship Hydrodynamics Centre: Conducts research in ship and offshore hydrodynamics, coastal hydraulics, aerodynamics, environment, water transport and information technology.
IEEE Bulgaria: Regional section of the institute of electrical and electronics engineers.
Wide Field Plate Database: Contains the descriptive information for the astronomical wide-field (>1°) photographic observations stored in numerous archives all over the world.