BioSig is a software library for processing of biomedical signals (EEG, ECG, etc.) with Matlab, Octave, C/C++ and Python. About 50 different data formats are supported.
simECG is an ECG signal simulator aimed for basic training and experimenting. As a full softwareECG signal generator, it's ideal for training and demonstration purposes. You can create customizable signals usually present in many pathologies.
A software to perform a full analysis of heart rate variability (time domain, frequency domain and nonlinear dynamic) for research purpouse and, I hope, for improve diagnostic power of Holter ECG recording.