TunesKit iBook Copy for Mac - Easily remove DRM protection from Apple iBooks and copy DRM protected iBooks to DRM free ePub files.
Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.
OpenAudible - OpenAudible Project Page
AppleMacSoft DRM Converter for Mac - Legal Convert iTunes and Apple Music M4P to MP3 on Mac with DRM Converter 3.
Kingshiper MP3 Converter - Kingshiper MP3 Converter is a reliable and easy-to-use tool to convert your music files into MP3 format in seconds.
Easy M4P Converter - Easily remove DRM from iTunes DRM protected files, and batch convert M4P to MP3