Description of the test methods used for SQLite. The statements
 Valgrind is a simulator - it simulates an x86 running a Linux binary. (Ports of Valgrind for platforms other than Linux are in development, but as of this writing, Valgrind only works reliably on Linux, which in the opinion of the SQLite developers means that Linux should be the preferred platform for all software development.)
are interesting, I did not get this from a casual reading of Valgrind's documentation.

Matplotlib is a comprehensive library for creating static, animated, and interactive visualizations in Python.

fincore ("File IN CORE") is a command that shows which pages (blocks) of a file are in core memory. It is particularly useful for determining the contents of the buffer-cache. The latest distribution can be found at http://pages.cs.wisc.edu/~plonka/fincore/

Computer mouse produced in Germany, trying to use fairly produced materials.

Description of reverse-engineering the USB protocol of a device no longer supported.

Found on Leah Neukirchen's blog https://leahneukirchen.org/trivium/2021-10-03 which links to
https://blog.benjojo.co.uk/post/imaging-mounted-disk-volumes-live

A high-quality, low-cost (€299), open-source, and not-for-profit cutting-edge analog computer.
See https://analogparadigm.com/documentation.html for some interesting examples.

Found on Leah Neukirchen's blog https://leahneukirchen.org/trivium/2021-12-05

Description of the various programs involved in sending and receiving e-mail, as of 2012.

Failed attempt to build sbcl on Android using ecl, which exists both as inofficial Termux package and as Termux-independent Android app
https://gitlab.com/eql/EQL5-Android/
But I believe that ECL only provides a byte compiler since native compilation is done via C.
See also https://www.christopherbiscardi.com/2014/1/10/common-lisp-on-android-running-the-mocl-android-example

While this blog article is about a new feature of the Scheme-based Guix Linux package manager, it contans the following interesting observation about erroneous shell settings: "it’s not uncommon for the shell to mess up with the whole environment. Why? Because, contrary to documented practice, it’s quite common for users to define or override environment variables in the startup files of non-login shells, ~/.bashrc for Bash, ~/.zshrc for Zsh. Instead, environment variable definitions should go to the startup file of login shells—~/.bash_profile, ~/.profile, or similar. But let’s face it: it’s a subtle distinction that few of us know or care about."