Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
Helium Music Manager - You can take control of your music collection.
LibriVox - free public domain audiobooks
Music Collection - This Music Collection Software allows you to organize your music collection including CDs, MP3s or vinyl records into a fully searchable database.
LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.
Waf Music Manager - Waf Music Manager is a lightweight and fast application that helps to organize the local music collection, such as large music files, edit, video formats support, high resolution, and many more.