EDF file format is used to store multichannel medical signals as EEG signals (Electroencephalography ), ECG (electrocardiograph), EMG (electromyograph), PSG and others. More info for ECG file format can be found here.
EDF Viewer is an application that allow you to browse EDF files.
Download desktop version for MS Windows, for MacOS or for Ubuntu
(For Ubuntu Extract .tgz file in a folder and in this folder execute $ sh EDFviewer.sh)
A mobile Android application can be found in Google Play or in APK Pure or can be downloaded as apk file: EDFViewer.apk
The source of EDF Viewer for Desktop platforms can be found in Github. The code is written in c++ and it is available under MIT License.
Samples of EDF files: samples.zip