LAME 3.99.5 - Audio encoder for MP3 files.. (Free): "LAME is an open source audio encoder. It is NOT developed by Thalictrum. All necessary info, license and source code can be freely obtained from http://lame.sourceforge.net/.
Version 3.99.5: Release notes were unavailable when this listing was updated.
Mac OS X 10.3.9 or later
(Via MacUpdate - Mac OS X.)