The SmartPi expansion module extends the Raspberry Pi by interfaces for voltage measurement and non-contact current measurement and thusbecomes a fully-fledged SmartMeter that controls and records powerconsumption and power generation and makes it available in the network or the Internet.

This looks much simpler than the other examples I have seen so far. I am not sure whether the blog is also generated from .org files.
Some interesting articles:
https://qorg11.net/tech_posts/freebsd_as_desktop.html
https://qorg11.net/openbsd.xhtml

Collection of links with information about, simulators of and software for the pdp-10.

Found on http://www.pfarrell.com/

It was mentioned on a Lisp-related site or mailing list, I do not recall which one.

Polynomial root finder for {dm,hp}42s using Laguerre's method. Found on https://forum.swissmicros.com/viewtopic.php?p=20091#p20091
The Emacs tools for {dm,hp}42 code on https://richmit.github.io/hp42/hp42s-meta.html and the
Lisp library http://www.mitchr.me/SS/mjrcalc/ look interesting too.

An open source implementation of SCCS, found via https://www.tuhs.org/pipermail/tuhs/2022-June/025898.html
The comparison to RCS on http://sccs.sourceforge.net/sccs_vs_rcs.html appears to be one-sided, but then I am probably biased towards RCS, which was the first version control software I have used.
http://sccs.sourceforge.net/sccs_invention.html sounds like an interesting read.
The last message on the mailing list https://sourceforge.net/p/sccs/mailman/sccs-devel/?viewmonth=201510 I found had been written 2015-10.
According to https://de.wikipedia.org/wiki/J%C3%B6rg_Schilling, the author Jörg Schilling passed away on 2021-10-10.
TODO: find out the license

Improved word lists for dice-generated passphrases, found via https://michael.kjorling.se/password-tips/

Found via rtl-sdr.com where the packet radio modem https://elekitsorparts.com/product/npr-70-modem-by-f4hdk-new-packet-radio-over-70cm-band-amateur-radio-packet-radio was mentioned.