First chapter of the IPython Cookbook, Second Edition, by Cyrille Rossant, a guide to numerical computing https://ipython-books.github.io/
Found on https://cyrille.rossant.net/ via the article https://cyrille.rossant.net/moving-away-hdf5/ cited on Peter Monta's blog http://www.pmonta.com/gnss-sky-recordings.html

Found via a comment on https://github.com/excalidraw/excalidraw

Interesting observations on large language models. Found via my bookmark https://roland.iwasno.net/links/?ONVyBw which points to https://occasionallycogent.com/new_blog_setup/index.html

PCLinuxOS Magazine is a free, independent, community produced magazine dedicated to the PCLinuxOS family of operating systems. Each release will contain helpful how-tos, articles and reader submitted stories. The magazine and website were created to help users find their way around the OS, while at the same time, pointing users to the proper website for the extra help that may be needed. It is also our intention to promote PCLinuxOS, its remasters and related websites.

Mentioned on the COFF mailing list https://www.tuhs.org/pipermail/coff/2023-May/001531.html

Work with Git forges, such as Github and Gitlab, from the comfort of Magit and the rest of Emacs.
Found on https://github.com/fstamour/local-gitlab which was mentioned on https://lisp-journey.gitlab.io/blog/i18n-in-my-lisp-web-app-with-djula-templates-and-gettext/

Recently a DCF77 receiver and decoder program based on Python and GNU Radio has been uploaded to GitHub
https://github.com/henningM1r/gr_DCF77_Receiver
by henningM1r. It includes a simulator written in Python so you can simulate your own DCF77 signal for testing the receiver too.

Currently the decoder has been tested to work with an Airspy HF+ Discovery SDR, but it should work with any SDR capable of receiver 77.5 kHz if the GNU Radio source block is changed out.

Found via https://cpbotha.net/2016/11/27/android-security-in-2016-is-a-mess/

SC4 is a secure communications system specifically designed for (relatively) easy auditability by way of a ruthless commitment to simplicity. SC4 provides the functional equivalent of PGP from the end-user's point of view, but implements it in two order of magnitude less code. The cryptographic core of SC4 is Daniel J. Bernstein's TweetNaCl library (<800 LOC). On top of this we have a variety of UI implementations ranging from 1000 to 5000 LOC. One of these has completed a formal audit to date.

Found on https://soldersmoke.blogspot.com/2017/05/indonesian-bitx-check-out-britx.html

Found on https://www.theregister.com/2023/02/09/balthazar_free_hardware_laptop/

Completely open hardware and open-source firmware. N-Key rollover: Diodes on every keyswitch prevent ghosting. Controller: ATmega32U4 with open source firmware based on LUFA. Easy to update via USB.

Now also supported by the popular QMK firmware.