You could have downloaded Ambi2Bin 4.6.3 for Mac from our software library for free. The application is included in Audio & Video Tools. The application's installer is commonly called ambi2bin_.zip or Ambi2Bin~.zip etc. This free software for Mac OS X is an intellectual property of Miguel Negrão. The most popular version of the tool is 4.6.
From the developer:
Ambi2Bin is a small application that allows you to convert ambisonics signal into Binaural signal. You will need an ambisonics decoder to decode to 7 speakers (6 speakers horizontal symetrical ring and one speaker on top). You can use JackOSX to route audio to this app.
You may want to check out more software for Mac, such as Aiseesoft MPEG Converter for Mac, iTunesLister or STAMPot, which might be similar to Ambi2Bin.