This site lists free online computer science, engineering and programming books, textbooks and lecture notes, all of which are legally and freely available over the Internet. Throughout this site, other terms are used to refer to a book, such as ebook, text, document, monogram or notes.
What's the Catch?
None. All the books listed in this site are freely available, as they are hosted on websites that belong to the authors or the publishers.
Note that each author and publisher has their own terms and conditions in the forms of free / open documentation licenses, public domain or other specific ones.
You are allowed to view, download and with a very few exceptions, print the books for your own private use at no charge. In fact, you are encouraged to tell others about the books.
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