
Alfa Ebooks Manager contains built-in audiobook player for MP3 and M4B files, so you can use it to listen to your audio books.
All parts of each audio book should be attached to the same book card. You can add them manually in the Book card -> Files tab, merge in Scan or merge parts into single books after Scan (using Merge Books icon).
To start playing audio book make a right-click on a book and select Play Audiobook in the context menu. Audio player shows you audio book files and allows to sort them by track#, title or duration.
You can use the familiar controls to pause, stop, rewind and toggle audio books.
The place in the audiobook where you stopped listening is remembered, and next time you can continue listening from this place.