The OpenEEG project is about creating a low cost EEG device. Working hardware has been built and is in a late beta stage. Software is still only alpha.
Many people are interested in what is called neurofeedback or EEG biofeedback training, a generic mental training method which makes the trainee consciously aware of the general activity in the brain. This method shows great potential for improving many mental capabilities and exploring consciousness. Other people want to do experiments with brain-computer interfaces or just want to have a look at their brain at work.