mpg321 0.3.2 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 following version: 0.2 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus. This free Mac app was originally designed by Joe Drew and Stephen Depooter. The application relates to Audio & Video Tools.
From the developer:
mpg321 is a very popular command-line mp3 player. mpg321 is used for frontends, as an mp3 player and as an mp3 to wave file decoder (primarily for use with CD-recording software.).
You may want to check out more software for Mac, such as Aiseesoft WMV Converter for Mac, which might be similar to mpg321.