BayTex Fiesta: Macintosh utility for mixing and crossfading MP3 files (Requires MacAmp).
Cabrio: MP3 player and skins, and skin creation utility
DropMP3: Macintosh MP3 encoder based on LAME source code.
iLoveMP3: Converts OGG, MIDI, and AAC files to MP3.
Liquid Audio: Liquid Player: plays multiple formats (MP3, Liquid Audio, AIFF, audio CDs) and codecs.
MegaSeg: Mobile DJ music automation system for the Macintosh. Plays Quicktime and MP3 files.
Mint Audio: Low RAM and CPU usage mp3 and audio player with downloadable skins and plugins.
MP3 For The Mac: MP3 charts, encoders, decoders, Mac players, portable players, news, MP3 history and links to MP3 related sites.
MPEG Audio Software: Simple Macintosh MP3 player/decoder.
MPegger: MP3 encoder for AIFF, Sound Designer II, PCM audio files. formerly titled MPecker
MPlay: Free multimedia player for the Macintosh including support for MP3 files. Also features the use of skins, ID3 tags, playlists, track mixing, pitch adjust, overlapping, and fading.
MusicAgain: Fair sized listing of mostly Macintosh MP3 software including players, encoders, other programs and utilities.
N2MP3 Pro: Commercial MP3 encoder for the Mac
On Air 2.0: Virtual MP3 radio studio or a virtual DJ mixer for Macintoshes. Site contains a list of features, a FAQ, and a shareware version for download.
RadioRecorder: Application designed to record Internet radio streams into mp3 files.
SoundApp: Freeware PowerPC native sound player and converter for the Macintosh.