The Theoretical Physics Reference is an attempt to derive all theoretical physics equations (that are ever needed for applications) from the general and special relativity and the standard model of particle physics.

The goals are:

   All calculations are very explicit, with no intermediate steps left out.
   Start from the most general (and correct) physical theories (general relativity or standard model) and derive the specialized equations from them (e.g. the Schrödinger equation).
   Math is developed in the math section (not in the physics section).
   Theory should be presented as short and as explicitly as possible. Then there should be arbitrary number of examples, to show how the theory is used.
   There should be just one notation used throughout the book.
   It should serve as a reference to any physics equation (exact derivation where it comes from) and the reader should be able to understand how things work from this book, and be ready to understand specialized literature.

Tutorials for a number of programming languages, software tools and some mathematical concepts.

Noise is a framework for crypto protocols based on Diffie-Hellman key agreement. Noise can describe protocols that consist of a single message as well as interactive protocols.
Used in WireGuard https://www.wireguard.com/

An Elementary Primer on Elementary Particles and their Interactions

Mailing list for fans of the incompatible timesharing system (ITS).

A critical review of John Ousterhout's “A Philosophy of Software Design”.
The blog has other interesting articles, for example
http://www.pathsensitive.com/2018/01/the-three-levels-of-software-why-code.html

Collection of articles describing various applications for the Raspberry π (in german).

A reading protocol is a set of strategies that a reader must use in order to benefit fully from reading the text. Poetry calls for a different set of strategies than fiction, and fiction a different set than non-fiction. It would be ridiculous to read fiction and ask oneself what is the author's source for the assertion that the hero is blond and tanned; it would be wrong to read non-fiction and not ask such a question.  This reading protocol extends to a viewing or listening protocol in art and music. Indeed, much of the introductory course material in literature, music and art is spent teaching these protocols.

Mathematics has a reading protocol all its own, and just as we learn to read literature, we should learn to read mathematics.  Students need to learn how to read mathematics, in the same way they learn how to read a novel or a poem, listen to music, or view a painting.  Ed Rothstein’s book, Emblems of Mind, a fascinating book emphasizing the relationship between mathematics and music, touches implicitly on the reading protocols for mathematics.

From the book Rediscovering Mathematics: You Do the Math by Shai Simonson. http://web.stonehill.edu/compsci/RediscoveringMath/RM.html

Prototype of a translator from a python-like syntax to C. Found via
https://www.jwz.org/blog/2017/04/python-has-a-lot-to-fucking-answer-for/#comments

On http://xed.ch/help/, a number of useful personal technical notes can be found.

For example, http://xed.ch/help/usbdrive.html describes how to create bootable USB drives.

Example of an Org-mode document.