Smart AudioBook Player - Smart AudioBook Player app comes up with features to help you in casting all your audiobooks to Chromecast enabled devices so you can enjoy them with your friends and family members.
LibriVox - free public domain audiobooks
Voice - Convert texts to audio files easily... Write your text, click export.
OverDrive Media Console - Download eBooks and audiobooks from your library directly to your iPhone, iPad, and iPod Touch!
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
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.