Crypto 101 (Site, cc-nc) - the introductory book on cryptography The little book about OS development (Site, cc-nc-sa) - This is the source code for the book "The little book about OS development" How to Design Programs (Site, cc-nc-nd) Structure and Interpretation of Computer Programs (Site, cc-sa) Programming Languages: Application and Interpretation (Site, cc-nc-sa) Practical Foundations for Pr