Bookyards.com	A large free online library, containing free digital books, journals, reference materials and educational resources mostly in PDF format.
ClassicAuthors.net	The works of many classic authors online, directly accessible using your Webbrowser.
Google Scholar	Search-engine for educational and school-related topics.
Project Gutenberg	16000 free eBooks. The oldest collection of free eBooks on the Internet, produced by hundreds of volunteers.
Questia	Large online collection of books and articles from authorative academic and commercial publishers. Ideal for researchers. Subscription fees range from $ 8.33 to $ 19.95 per month.
Read Print	A wonderful online library with thousands of free e-books which you can read in your Web browser.
Representative Poetry On-line	Large free online library of poems.
Safari Bookshelf	Online reference library for programming and IT professionals. Read and search thousands of IT books from various publishers Subscription fees range from $9.99 to $34.99 per month
Shakespeare	The Complete Works of William Shakespeare, online for free.
The National Science Digital Library	An online science library with links to high quality science, technology, engineering, and math resources for K-12 teachers, faculty, librarians, students and informal learners.
World Wide School Library	Over 2,000 free online eBooks on a variety of subjects.