Internet Shakespeare Editions, University of Victoria, Canada (Full Text and in some cases full images of pages, Also included, "Shakespeare in Performance is a searchable database of performance materials from over 1000 film and stage productions related to Shakespeare's works." Much more)
A list of various Shakespeare materials via the wonderful Online Books Page that we've been mentioning on ResourceShelf for years. Material from Project Gutenberg is included in this database.
If you're looking for books about Shakespeare as well as material that William S. authored, we would suggest taking a look at another service that ResourceShelf has been writing about for a long time, ebrary. This company usually sells its services to libraries. However, at this url you can open an account (free) with as little as $5.00. Searching and reading online (full text, full image, no limits) is free. You pay only (money deducted from the account) to print or copy a page (about 25 cents/USD). Over 20,000 books in the Shop ebrary collection. I found hundreds of books about Shakespeare (nice use of hyperlinked cataloging, btw) and 63 books by W.S. himself. More about ebrary here.
Finally, many libraries also offer free full text and full image access to NetLibrary. Many have Shakespeare content in their collections. More about NetLibrary here and here.
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