There a number of interesting articles such as
- The Mystery of the Grazing Goat  http://www.mathpages.com/home/kmath074/kmath074.htm
- On The Solution of the Cubic Equation  http://www.mathpages.com/home/kmath444/kmath444.htm
- Infinite grid of resistors, ...

For a good example, read http://www.evanmiller.org/dont-kill-math.html

Abstract.
ElsieFour (LC4) is a low-tech cipher that can be computed by hand;
but unlike many historical ciphers, LC4 is designed to be hard to break. LC4 is intended for encrypted communication between humans only, and therefore it encrypts and decrypts plaintexts and ciphertexts consisting only of the English letters A through Z plus a few other characters. LC4 uses a nonce in addition to the secret key, and requires that different messages use unique nonces. LC4 performs authenticated encryption, and optional header data can be included in the authentication. This paper defines the LC4 encryption and decryption algorithms, analyzes LC4’s security, and describes a simple appliance for computing LC4 by hand.

An extended version called LS47 can be found on https://github.com/exaexa/ls47, which includes a 3D-printable model of the tiles.

The links are associated with a timeline visualization, a curated data set, and a repository detailing the evolution of 15,596 unique documented facilities (commands, system calls, library functions, device drivers, etc.) across 93 major Unix releases tracked by the Unix history repository.

Skywave Linux is a 64 bit system, built on a base of Ubuntu 16.04 LTS, uses the MATE desktop environment, and draws on the capabilities of Ubuntu: software updating, graphics, system resource management, etc. It is the additional digital signal processing, networking, and signal decoding applications that set Skywave Linux apart from stock Ubuntu Linux. The default username is skywave and there is no password in the default system.

On-line collection of small computers from 1950-1990.

EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs. The EditorConfig project consists of a file format for defining coding styles and a collection of text editor plugins that enable editors to read the file format and adhere to defined styles. EditorConfig files are easily readable and they work nicely with version control systems.

Example programs, (off) images and photos of the internals of the SwissMicros DM42 calculator.

Lixie is an edge-lit acrylic display for any numeric information you can think of! Clocks, temperature displays, hit counters, and more. Always being a fan of the beautiful typography of a Nixie Tube, the Lixie is a modern spin!