PDF Previewer for Windows 8 - Features of PDF Previewer for Windows 8, Windows 8.1 - Preview PDF document with PDF preview handler technique
OpenAudible - OpenAudible Project Page
APV - Open Source PDF Viewer for Android based on MuPDF library
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.
POKATreader - With POKATreader you can read your PDF files in full-screen mode, but one of the best features is...
TunesKit Audible AA/AAX - Audible AA/AAX Converter by TunesKit is an application that enables you to convert audible AA and AAX files to the formats that are supported by other devices.