LibriVox - free public domain audiobooks

Helium Music Manager - You can take control of your music collection.

Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.

Music Collection - This Music Collection Software allows you to organize your music collection including CDs, MP3s or vinyl records into a fully searchable database.

Mobilism.org - A home for book lovers, app enthusiasts, and much more.

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.