If you are in the market for a free, Open Source audio conversion app, and you don’t mind a working with a simple interface, then you can’t go far wrong with Freac for Mac. Beneath the standard, bare bones window lies powerful open source conversion encoders that are able to rapidly convert your audio files to a good selection of formats.
Not only can Freac for Mac convert an array of audio files, but it can also rip audio CDs as well. The app can access the online CDDB database to automatically populate the metadata attached to your media files, so they can be organized correctly in your media library. This is really useful as it saves a stack of time in manually adding the data yourself.
Freac for Mac also comes with a couple of neat tools and configurable features, such as a built-in media player, with standard functionality; play, pause, stop, and skip next or skip previous.
When saving content, you can choose a default saving directory, select the encoder you need, apply some audio filters, such as High-pass or Low-pass, create various playlists and cue sheets, install plugins, and you can edit ID3 tags as well. You can even batch process files, if you need to.
Overall, Freac for Mac supports a wide array of formats, including .MP3, .Bonk, .WMA, .MP4/M4A, .AAC, .Ogg .Vorbis, .FLAC, and .WAV. It has a good selection of configurable options, and it is available in over 36 languages.