PhysioNet

PhysioNet: physiological signal and clinical datasets — ECG, EEG, polysomnography, and the MIMIC critical-care databases. Use to find waveform or bedside monitoring data. Reports each dataset's access tier; roughly half are open and downloadable. The MIMIC and eICU databases require ethics training and a signed agreement, so results for those name the open demo subset carrying real de-identified records from the same source, which needs no credentials — prefer it when the user wants to actually work with the data.