freac supports many popular formats and encoders and is a free audio converter. It can convert between MP3, M4A/AAC/Opus, FLAC, Ogg Vorbis and other formats. It can convert audio files that don't play well with other audio software to MP3 or M4A format. Convert entire music libraries while keeping the filename and folder structure. The integrated CD ripper supports CDDB/freedb online CD databases. It will query song information automatically and convert it to ID3v2 tags or other title information tags.
The download provided here is for OS X 10.5 up to 10.15. A download for macOS 11.0 Big Sur is available in the 'Other Requirements' section (press Show More).