Brain Cyb (also known as Nanjing Brun Technology, 南京布润科技有限责任公司) is a company specializing in electroencephalogram (EEG) equipment and software. It offers free-combination EEG caps, EEG electrodes, all-purpose EEG processors, and EEG recording and analysis software. The company also provides brain-computer interface products for psychology research and development as well as education and training applications.