The 1.8 version of AutoMute for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The actual developer of this free Mac application is Lorenzo Gentile. The program is included in Audio & Video Tools.
From the developer:
AutoMute allows you to tell your computer to mute or unmute your Macbook when you connect to certain wifi networks, eliminating the need to remember to mute and unmute your laptop and giving you the peace of mind that your laptop won't start playing sounds in the middle of class or in the office.
You may want to check out more software for Mac, such as Auto Mute, which might be similar to AutoMute.