Download of SmartStop 1.0 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 most popular version among SmartStop for Mac users is 1.0. The application is included in Audio & Video Tools. The latest version of the program is supported on Mac OS X 10.6 or later. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Imre Katai.
From the developer:
Do you like when you pull out the headphone cable from your iPhone the music stops? Well, from now on, with this simple application, your mac will do it too.
Moreover, if you wish, it can automatically start the music when you plug in your headphone or speaker.
You may want to check out more Mac applications, such as Radiologik DJ, SoundByte or AudioTuner, which might be similar to SmartStop.