Cog is a free open source audio player for OS X. Currently it supports the following formats:
Ogg Vorbis
Mp3
Flac
Musepack
Monkeys Audio
Shorten
Wavpack
AAC
Apple Lossless
and more!
Features:
General
Gapless Playback
Seeking
Automatic updating
Feedback form
File drawer
Preferences
Last.fm support
Growl support
Global hotkeys
Formats
Ogg Vorbis
Mp3
Flac
Musepack
Monkeys Audio
Shorten
Wavpack
AAC
Apple Lossless
Wave/AIFF
Video Game (nsf, gbs, gym, spc, vgm, hes, and more!)
Tracker (it, s3m, xm, mod)
m3u and pls playlists
Cue sheets
Tags
Vorbis comments
ID3v1.0, 1.1, 2.3+
Flac tags
APEv1 and v2
Languages.