EDFbrowser

EDFs hosted on the NSRR are compatible with EDFbrowser a free viewer that works across multiple platforms. The following description is from the tool's GitHub repository.

A free, open-source, multi-platform, universal viewer and toolbox intended for, but not limited to, time series storage files like EEG, EMG, ECG, BioImpedance, etc.

http://www.teuniz.net/edfbrowser/