TunesKit iBook Copy for Mac - Easily remove DRM protection from Apple iBooks and copy DRM protected iBooks to DRM free ePub files.
OpenAudible - OpenAudible Project Page
DRmare Audio Converter - DRmare Audio Converter for Windows is a complete audio DRM removal tool designed to convert both protected audios, including Apple Music, Audible audiobooks, iTunes music, and common audios to MP3, WAC, FLAC, M4A, AAC, etc.
RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
TuneFab Audible Converter - TuneFab Audible Converter is a cross-platform application that enables you to remove or bypass DRM protection from your audible eBooks.
UkeySoft Audible Audiobook Converter - UkeySoft Audible Audiobook Converter is a popular AAX/AA to MP3 converter, it not only can remove DRM from Audible books, but also can convert Audible AA/AAX audiobooks to MP3, M4A, AAC or FLAC with 100% original quality preserved.