AudioBookBinder - Got a lot of audiobooks in MP3 format and would like to listen them on your iPod?
LibriVox - free public domain audiobooks
Listen to books for free - Listen to books for free is an app by Anyreads that allows users to listen to up to 7000 audiobooks right on their mobile phones.
DigitalBook.io - Free audio books and eBooks. Search, browse, listen, read and download over 100,000 free audio books and eBooks.
Audiobook Builder - Audiobook Builder is a software that enables users to turn their audio files into audiobooks which they can sue then on their iPhone, iPad, or any other Apple devices.
Downpour.com - Listen to high quality audiobooks instantly. Download audiobooks to your iPhone, Android, or other listening device. Find titles including best-sellers and new releases. Downpour, where content reigns.