The Ray Tracing in One Weekend series of books are now available to the public for free online. They are now released under the CC0 license. This means that they are as close to public domain as we can get. (While that also frees you from the requirement of providing attribution, it would help the overall project if you could point back to this web site as a service to other users.)
A more modern wiki focusing on open technologies like SOAP and XML, and upon a more focused form of wiki software that incorporates the elements of traditional content creation, such as from journals, books or periodicals.
fortune-mod-isec is a compilation of straps/tips from the Information Security World. The straps have been compiled/produced from the Internet, books, norms, standards & collaborators' know-how.
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A C++/Qt program for use in encrypting and decrypting simple substitution cyphers. These cyphers are often found in newspapers and various puzzle books.