The LaTeX project maintains and develops the LaTeX typesetting system. Found via https://www.tuhs.org/pipermail/tuhs/2022-January/025113.html

Home page of Ali Gholami Rudi. Found on fefe's homepage
https://www.fefe.de/
His troff implementation Neatroff has been mentioned on TUHS https://ww.tuhs.org/pipermail/tuhs/2022-January/025071.html
See also https://github.com/aligrudi/neatcc, a a small ARM/X86(_64) compiler for a subset of C; a brief introduction can be found on https://litcave.rudi.ir/neatcc.pdf, a small test suite on https://litcave.rudi.ir/ncctest.tar.gz

Found on https://www.rousette.org.uk/archives/learning-go/

Kalibrate, or kal, can scan for GSM base stations in a given frequency band and can use those GSM base stations to calculate the local oscillator frequency offset.

Maemo Leste continues the legacy of Maemo. We aim to provide a free and open source Maemo experience on mobile phones and tablets like the Nokia N900, Motorola Droid 4, Motorola Bionic, Pinephone, Pinetab, Allwinner tablets and more!

Wiki about the 9front branch of the Plan 9 operating system.

Found via the TUHS mailing list https://www.tuhs.org/pipermail/tuhs/2021-December/024902.html
This post describes his org-mode setup, but other entries about his work on various emulators are interesting too.

Found via Sacha Chua's blog https://sachachua.com/blog/2021/12/2021-12-27-emacs-news/

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.