Note as of version 1.0.1 the build is specific for a Mac M1 (aarch64). At this time I am not able to build multi-platform but would love the assistance
Relatively full fleched fee audiobook creation software
Bakes mp3 files to Audiobook (m4b) format.
It is a freeware / Donate ware.
You can read more about Opening "Unidentified Developer" Apps On Your Mac to learn more about the risks and problems. You don't have to be scared of Unsigned software, just be aware...
The source code of this project and more information can be found here.