Audion was a CD, MP3, and net radio player that was quite popular until iTunes became huge. It's now a free download for the historically curious.
Cog is an audio player that supports many popular file formats, including Ogg Vorbis, Flac, Musepack, Mp3, Shorten, Wavpack, AAC, and Monkeys Audio. Features include seeking, smart shuffle, and the ability to read unicode tags.
EdLibPlay is a tiny little player for Vibrants' EdLib music (also known as D00 files). This is a format that was used for music created on the PC for AdLib sound cards.
Folder Player is a music player which uses folders as playlists. You simply drag folders to list and double click to play. Folder Player reads tags and displays artwork of songs.
M1 is an Arcade music player. M1 plays the music from arcade games by running the code in the original ROMs (not supplied).
Melody player is a little program for playing music files created with Harmony or Melody Assistant, as well as Midi, MOD and S3M files. Melody player includes the light version of the digital sound database, so it does not need any Midi card or interface.
Milkytracker is a free music creation tool inspired on Fast Tracker 2 (a popular MS-DOS tracker for the PC). Milkytracker offers accurate module playability based on Fast Tracker 2 (XM) and Protracker (MOD) engines.
Minitunes is just another music player, only better. Minitunes unclutters your music listening experience with a clean and innovative interface.
Audio player, transcoder and cd ripper for Mac OS X, OS 9, Windows, Unix, and Linux. Plays and creates ogg, flac, mp3, aac, m4a, mp4, wav, and aif, and plays wma. 31-band equalizer, repeat loop, variable pitch/tempo, ram or ramdisk preload, more.
mpc123 is software to play Musepack files on the console. It supports random play, playlists, and volume control.
PandoraMan is a small cocoa app to run the Pandora mini player using WebKit.
Play is an application for playing and managing audio files. Play currently supports playback of FLAC, Ogg Vorbis, Musepack, WavPack, Monkey's Audio, AAC, Apple Lossless, MP3 and various other audio file formats.
Play Sound is a simple, no-fuss sound player. It supports QuickTime sound files (for example, AIFF or MP3 files), Classic Mac OS System 7 sound files (files with a file type of 'sfil' that contain 'snd ' resources), or any 'snd ' resources embedded into any file.
SIDPLAY is a Commodore 64 music player. It emulates the sound chip and other internals of the Commodore 64 home computer to play back music that was originally written on it. The sound chip was called the "Sound Interface Device" or SID, and therefore this music is known as SID music. The SID chip is basically a three voice synthesizer on a chip. The unusual combination of digital and analogue circuitry is the reason for its distinctive sound.
SoundApp Reborn is a simple, no-nonsense sound effect/audio player. No fuss. No skinning, no plugin architecture, no fancy G-Force visualization something thingimajig. Just playing sounds.
SoundDog is a simple QuickTime-based applescript droplet that acts as a sound inspector. It is designed to be placed in your folder toolbar so that you can quickly drag and drop any audio file(s) onto SoundDog's icon to hear playback and view a detailed description of the file.
SystemSound Extension plays sound files like you did in Mac OS Classic, by double-clicking them. SystemSound plays: AIFF, AIFC, WAVE, MP3, MP2, MIDI, SD2, ULAW, WMA and system 7 sounds.
Taply is a simple soundfile player. The main difference between Taply and other players lies in the fact that it consists of nothing more than a tiny floating window and that it will quit after having finished playing.
X Lossless Decoder
X Lossless Decoder (XLD) is a tool that is able to decode/convert/play various 'lossless' audio files. The supported audio files can be split into some tracks with cue sheet when decoding.