Project Gutenberg:
Project Gutenberg offers over 58,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world’s great literature here, with focus on older works for which U.S. copyright has expired. Thousands of volunteers digitized and diligently proofread the eBooks, for enjoyment and education.
Directory of Open Access Books:
The primary aim of DOAB is to increase discoverability of Open Access books. Academic publishers are invited to provide metadata of their Open Access books to DOAB 15596 books.
The National Academies Press (NAP)
NAP publishes more than 200 books a year on a wide range of topics in science, engineering, and medicine, providing authoritative, independently-researched information on important matters in science and health policy.
Open textbook Library
Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality.
https://open.umn.edu/opentextbooks
DAR- Bibliotheca Alexandrina
The Digital Assets Repository (DAR) is a system developed by the BA International School of Information Science to create and maintain the Library’s digital collections. Over 210,000 books and 35,000 images are now available online. All out-of-copyright books are available in full for Internet users.
http://dar.bibalex.org/webpages/dar.jsf
Global Book Alliance
The goal of the Global Book Alliance is therefore to provide access to free, high-quality, early grade reading resources in languages that children use and understand.
Arabic E-Books
https://digitallibrary.io/ar/topic/library-books/read-aloud/
French E-Books
https://digitallibrary.io/fr/topic/library-books/
Google Books
Search the world’s most comprehensive index of full-text books