GUI viewer for biosignals such as EEG, EMG, and ECG

 SigViewer is a viewing and scoring software for biomedical signal
 data. It relies on biosig4c++ library which supports a number of
 data formats (including EDF, BDF, GDF, BrainVision, BCI2000, CFWB,
 HL7aECG, SCP_ECG (EN1064), MFER, ACQ, CNT(Neuroscan), DEMG, EGI,
 EEG1100, FAMOS, SigmaPLpro, TMS32). The complete list of supported
 file formats is available at
 http://pub.ist.ac.at/~schloegl/biosig/TESTED .
 .
 Besides displaying biosignals, SigViewer supports creating
 annotations to select artifacts or specific events.