AudioBookConverter is built in Java by Yarick Yermak as opensource project inspred by freeipodsoftware tool built by Florian Fankhauser.
Your could ask for support by submitting issue on GitHub
AudioBookConverterX is built from scratch in Swift language specifically for MacOS.
You could request support by submitting ticket or emailing to support@recoupler.com
Applications are publishd by Recoupler Limited. Legal details could be found here.