OpenAudible - OpenAudible Project Page
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
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.
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!
AudKit AAX Converter - Full-featured AudKit Audible AAX converter to download and convert Audible audiobooks to MP3, AAC, M4A, M4B, etc. losslessly.
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!