App: HD Audiobook Maker
Developer: 君 许
Genres: Entertainment, Lifestyle

HD Audiobook Maker is the easiest and most convenient app for building audiobook in M4B format.

Many websites, such as AudioBooks.com, offer lots of complete audiobooks for free. The only problem is that these books come in many small MP3 files.
Drag and Drop: Easy!
HD Audiobook Make makes joining and converting these audiobook files a breeze. With the simplicity of macOS X, you just drag your MP3, FLAC files onto Audiobook Maker 2020 and click go!

Features:
HD Audiobook Make makes audiobooks easy with many easy to use features:
  •  Convert to MP3, AAC or FLAC
  •  Set many properties of your audiobook including bitrate, sampling frequency and number of channels
  •  Preview any chapter with the built-in audio player
  •  Reorder the chapters easily with drag and drop, or auto-sort
  •  When you're done, active m4b file in Finder.

Release notes:
This update contains stability improvements add bug fixes.