Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.
Macsome Audiobook Converter - Convert Audible Audiobook to MP3 / AAC at up to 300x faster speed and id3 tags kept.
DRMBuster - DRMBuster is a powerful all-in-one audio and video conversion software for any kind of purchased or legally obtained music and video.
TunePat Any Audiobook Converter - TunePat Any Audiobook Converter is an excellent Audible audiobook downloader designed for downloading and converting audiobooks in AA & AAX format from Audible to M4A/M4B/MP3 format.
AppleMacSoft DRM Converter for Mac - Legal Convert iTunes and Apple Music M4P to MP3 on Mac with DRM Converter 3.
Voice - Convert texts to audio files easily... Write your text, click export.