"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.

A new portable TECO based on TECO-32 V40. Written in C.
http://teco-lang.org
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The "save link" script does not appear to work on github, at least in Firefox/Windows. It works on Chrome/OS X.

SMART stats are inconsistent from hard drive to hard drive.

With nearly 40,000 hard drives and over 100,000,000 GB of data stored for customers, we have a lot of hard-won experience. See which 5 of the SMART stats are good predictors of drive failure below. And see the data we have started to analyze from all of the SMART stats to see which other ones predict failure.

Coordinate transformation between WGS84 and the coordinate system used in Austria. The blog contains other interesting articles.

This is a QR code generator for Emacs, written in Emacs Lisp. It's a CommonLISP-to-EmacsLISP port of the cl-qrencode package by jnjcc
See also https://github.com/ruediger/qrencode-el (added 2021-09-13)

Calculate CRC, generate Verilog and C code (licensed under the LGPL) for the calculation.

From the foreword by Tom Truscott:
Netizens: On the Impact and History of Usenet and the Internet is an
ambitious look at the social aspects of computer networking. It examines
the present and the turbulent future, and especially it explores the
technical and social roots of the "Net". A well told history can be
entertaining, and an accurately told history can provide us valuable
lessons.

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.

Papers & projects on developing secure software, free / libre / open source software (OSS/FLOSS), software innovation, & other interesting things...