I used Libation. It's free, it's open source and it worked great for me
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I'm personally a big fan of OpenAudible. It's not free, but it's not crazy expensive and it does all the work for you. You sign into your Audible account in the app, it will pull your library, download each book, decrypt it, and convert it to the format of your choice (I usually do M4B). I've been using it for years and it makes downloading your Audible library in an ongoing basis a breeze.
I checked out OpenAudible posted in this topic and it seems interesting, and might be a better choice. But if you're looking to rip your audible files yourself you'll want inAudible: https://github.com/rmcrackan/inAudible
There are other options around, but none of them are as free or as good as inAudible, IMO.