World Digital Library - World Digital Library is an international level e-library operated by UNESCO and the US Library of Congress.
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
DigitalBook.io - Free audio books and eBooks. Search, browse, listen, read and download over 100,000 free audio books and eBooks.
LibriVox - free public domain audiobooks
LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.
IQBAL CYBER LIBRARY - IQBAL CYBER LIBRARY is an online library giving you access to thousands of e-books in its system.