BioSig is an open source software library for biomedical signal processing, e.g. featuring the analysis of biosignals such EEG, ECG, EMG, respiration, and more. Major application areas are: Neuroinformatics, brain-computer interfaces, neurophysiology, psychology, cardiovascular systems and sleep research. The aim of the BioSig project is to foster research in biomedical signal processing by providing open source software tools for many different applications.