Binaural 2.5 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Lifestyle Tools, more precisely Healthcare & Fitness. This free software for Mac OS X was originally developed by Giorgio Calderolla. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Binaural is a simple and easy-to-use binaural beats generator. All you need to do is pick a frequency, hit play, and it'll do the rest. Binaural beats can help you relax, meditate, sleep, or even concentrate. You can set a timer to have Binaural go to sleep at a time of your choosing. You can select your favorite theme to match Binaural's colors to your taste and mood.
You may want to check out more software for Mac, such as Professor McMurphy Subliminal Visual Messages with Binaural Isochronic Music for Hypnosis & Subconscious Programing, Relax Melodies Seasons Premium or RelaxNow, which might be similar to Binaural.