The Universal Digital Library
The Universal Digital Library, a book-scanning project backed by several major libraries across the globe, has completed the digitization of 1.5 million books (and counting). The Universal Digital Library offers full text downloads of works that are in the public domain, or for which the copyright holder has been given permission to make available.
Universal Access to Human Knowledge - The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public.
Project Gutenberg allows you to download over 32,000 resources, that are part of the public domain, for free.
Useful You Tube Channels for Teachers
Covers 25 Multidisciplinary & General Education channels; 25 Visual, Performing & Liberal Arts channels; and, 50 Physical Sciences, Mathematics & Liberal Arts channels.