http://gnaural.sourceforge.net/
 

Gnaural is an opensource programmable auditory binaural-beat generator, implementing the principle described in the October 1973 Scientific American article "Auditory Beats in the Brain" by Gerald Oster. The theme of the article is that the processing of binaural beats involves different neural pathways than conventional hearing. Research inspired by the article went on to show that binaural beats can induce a "frequency-following response" (FFR) in brainwave activity. An early version of Gnaural called WinAural was used for at least one such published study, "The Induced Rhythmic Oscillations of Neural Activity in the Human Brain", D. Cvetkovic, D. Djuwari, I. Cosic (Australia), from Proceeding (417) Biomedical Engineering - 2004.