Here is a list of EEG studies in ESS format across the web (click on description link for each study to see an ESS-generated report with all the study meta-data):

Study ESS version Level 1 Container Level 2 Container Number of Sessions Description Raw Data Size
RSVP Target Detection 2 Download Download 15 Presents bursts of 12/s satellite image clips, some with an embedded target airplane image, without immediate button press 14.3 GB
Auditory-Visual Attention Shift 1 Download NA 49 Young and older adults perform a visual-auditory cued attention shift paradigm. 1.4 GB
Auditory Two-Choice 1 Download NA 12 Equally probable longer and shorter tones were so categorized by subjects 7.5 GB
Reward Two-Back CPT 1 Download NA 25 Visual two-back Continuous Performance Test with auditory feedback 10.8 GB
Modified Sternberg Working Memory Task 1 Download NA 23 Visual letter memory task (recall black letters; ignore green) 4.5 GB
Imagined Emotion 1 Download NA 32 Subjects listened to voice recordings that suggest an emotional feeling and ask subjects to imagine an emotional scenario 33.6 GB
Five-Box Task 1 Download NA 60 A visual spatial selective attentional oddball task 2.1 GB
NCTU Lane-keeping 2 Contact Contact 80 Drowsiness study with lane perturbation and response in a simulated car driving with and without VR-controlled motion. 28.75 GB
Experiment X2 Traffic Complexity 2 Contact Contact 28 Evaluates whether increasing Visual complexity of the driving environment affect's driver alertness and its regression-based estimation 16.23 GB
Experiment X6 Speed Control 2 Contact Contact 24 Evaluates whether the degree of interaction with the simulated vehicle, i.e., manual versus automatic control of vehicle speed, would affect driver alertness and its estimation 25.6 GB
Experiment XB Baseline Driving 2 Contact Contact 108 15-minute baseline driving sessions associated with all of the research areas specified within the Army Research Laboratory 266.7 GB
X1 Baseline RSVP 2 Contact Contact 23 Investigates whether performance of a non-driving task (RSVP) could be predicted using spectral data from electrodes overlying central-parietal regions 81.57 GB
X2 RSVP Expertise 2 Contact Contact 43 Investigates whether performance of a non-driving task (Expertise RSVP) could be predicted using spectral data from electrodes overlying central-parietal regions 150.8 GB
X3 Baseline Guard Duty 2 Contact Contact 18 Investigates whether performance of a non-driving task (Guard Duty) could be predicted 47.69 GB
X4 Advanced Guard Duty 2 Contact Contact 20 Investigates whether performance of a more complex  non-driving task (Advanced Guard Duty) could be predicted using spectral data from electrodes overlying central-parietal regions 50.44 GB
Experiment XC Calibration Driving 2 Contact Contact 196 15-minute calibration driving sessions associated with all of the research areas specified within the Army Research Laboratory 111.5 GB