Just what it claims. Apparently she managed to get a command line (the Terminal app has to be installed first).

Converting color temperature (Kelvin) to RGB.
The algorithm provides a high-quality approximation, but it’s not accurate enough for serious scientific use. It’s designed primarily for photo manipulation – so don’t try and use it for astronomy or medical imaging.

"Get a public key, safely, starting just with someone's social media username(s).
The goal is a simple way to look up and trust keys, based on known public identities."

Note that keybase has been bought by Zoom, which is not trusted by some people. See https://alexschroeder.ch/wiki/2020-05-08_Replacing_Keybase and https://idiomdrottning.org/pgp for an alternative using free software.

Articles about software complexity. The sanos operating system and the PDP-11 emulator running under it are interesting too.
http://www.jbox.dk/sanos/pdp11.htm

Vincenty's formulae are two related iterative methods used in geodesy to calculate the distance between two points on the surface of a spheroid, developed by Thaddeus Vincenty (1975a) They are based on the assumption that the figure of the Earth is an oblate spheroid, and hence are more accurate than methods such as great-circle distance which assume a spherical Earth.

The first (direct) method computes the location of a point which is a given distance and azimuth (direction) from another point. The second (inverse) method computes the geographical distance and azimuth between two given points. They have been widely used in geodesy because they are accurate to within 0.5 mm (0.020″) on the Earth ellipsoid.

Series of blog articles by Will Senn about running v6 unix on SimH.
On 2022-12-08 he migrated the blog to https://decuser.github.io/

A highly secure, comprehensive, easy-to-use replacement
for usernames, passwords, reminders, one-time-code
authenticators . . . and everything else.
The site contains other interesting things such as a TrueCrypt repository, password generators and other tools and information about the PDP-8.

A visual tool for wiring the Internet of Things.

Lots of information about amateur radio, software defined radio. From the author of linrad, a software receiver for Linux (which also runs under Windows and OS X).

ATS is a statically typed programming language that unifies implementation with formal specification. It is equipped with a highly expressive type system rooted in the framework Applied Type System, which gives the language its name. In particular, both dependent types and linear types are available in ATS.