Download of AudioSpeed 1.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Audio & Video Tools, more precisely Editors & Converters. We recommend checking the downloaded files with any free antivirus. The most popular versions of the tool are 1.6 and 1.4. The actual developer of this software for Mac is JS8 Media Inc.
From the developer:
AudioSpeed allows you to alter the playback speed of audio (and video) files, and independently or in addition alter the pitch rate. Ideal for learning tricky passages of music or vocals, as it will adjust the playback speed without altering the pitch, if you don't adjust the pitch slider.
You may want to check out more Mac applications, such as ImTOO iPhone Video Converter, ImTOO DVD to iPhone Converter or iCDc, which might be similar to AudioSpeed.