Developer website: Adam Green
To use FLACer, simply drag and drop the files you would like encoded (registered version only) or decoded into the list and press "Begin". Higher compression levels take more time to encode. FLACer supports AIFF, WAV, and CDDA (AIFC) formats, in addition to FLAC.
Flac files can be played using such applications as VLC on Mac OS X and xmms under X11.