1 - mpg321 0.2.10 mpg321 is a Free replacement for mpg123, a very popular command-line mp3 player. mpg123 is used for frontends, as an mp3 player and as an mp3 to wave file decoder (primarily for use with CD-recording software.) In all of these capacities, mpg321 can be used as a drop-in replacement for mpg123. License: Shareware OS: Unix