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

Free Audiobooks - Free Audiobooks is a digital audiobooks library app that comes up with an extensive collection of more than 14000 different audiobooks to help you in boosting up your knowledge right at your fingertips.

LibriVox - free public domain audiobooks

AudioBookBinder - Got a lot of audiobooks in MP3 format and would like to listen them on your iPod?

LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.

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.