Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
LibriVox - free public domain audiobooks
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.
Goodreads - See what your friends are reading.