Nim is a systems and applications programming language. Statically typed and compiled, it provides unparalleled performance in an elegant package.

   High-performance garbage-collected language
   Compiles to C, C++ or JavaScript
   Produces dependency-free binaries
   Runs on Windows, macOS, Linux, and more

Apart from the blog, there are technical notes https://www.johndcook.com/blog/writing/ and on-line calculators https://www.johndcook.com/blog/online-calculators/
As an example, see Camp-Paulson normal approximation to the binomial distribution https://www.johndcook.com/blog/camp_paulson/
The articles https://www.johndcook.com/blog/2024/04/01/more-laguerre-images/ and
https://www.johndcook.com/blog/2024/03/22/laguerres-root-finding-method/ demonstrate the basins of attraction for Laguerre's root-finding method.
https://www.johndcook.com/blog/2018/11/24/spheroid-distance/ should be useful for azel.
https://www.johndcook.com/blog/2020/02/08/arenstorf-orbit/ shows a periodic solution to the restricted 3-body problem.
https://www.johndcook.com/blog/2022/11/14/simultaneous-root-finding/ describes the Durand-Kerner polynomial root finding method.
https://www.johndcook.com/blog/2022/11/01/kepler-newton/ discusses solving Kepler's equation

TODO: https://www.johndcook.com/blog/2022/10/30/arctan-k-tan-t/ states "This plot looks similar to the plot of true anomaly for a highly elliptical orbit. I’m sure they’re related, but I haven’t worked out exactly how."

https://www.johndcook.com/blog/2022/10/21/math-origins/ explains V.I. Arnolds comment
"All mathematics is divided into three parts: cryptography (paid for by CIA, KGB and the like), hydrodynamics (supported by manufacturers of atomic submarines), and celestial mechanics (financed by military and other institutions dealing with missiles, such as NASA)."

https://www.johndcook.com/blog/2018/09/24/riemann-hypothesis-the-fine-structure-constant-and-the-todd-function/ is about  Sir Michael Atiyah's incorrect proof of Riemann's hypothesis, the article https://rjlipton.com/2018/09/26/reading-into-atiyahs-proof/ is an interesting read. (I had bookmarked this entry on Wed Sep 26 15:51:47 2018 and put it here 2024-04-03.)

The article https://www.johndcook.com/non_central_chi_square.pdf sounds interesting:
John D. Cook Upper bounds on non-central chi-squared tails and truncated normal moments (2010). UT MD Anderson Cancer Center Department of Biostatistics Working Paper Series. Working Paper 62.
Abstract. We show that moments of the truncated normal distribution provide upper bounds on the tails of the non-central chi-squared distribution, then develop upper bounds for the former.

The Android Framework provides access to raw GNSS measurements on several Android devices (Android 7 or higher is needed).

Priyom.org is an international group of radio enthusiasts who came together during 2010 when activity from the station known as "UVB-76" increased. The mystery of this station inspired us to seek out other, similarly mysterious stations, and thus into the bizarre world of shortwave radio's infamous number stations. Greatly inspired by the work of other online groups, Priyom has been developed to easily bring both the current and historical information about number stations into one comprehensive site, and to make the recording, listening and analysis of shortwave radio, number stations, and all related on-air enigmas accessible to all who are interested.

J1 is a small (200 lines of Verilog) stack-based CPU, intended for FPGAs. A complete J1 with 16Kbytes of RAM fits easily on a small Xilinx FPGA. Some highlights:
       Extremely high code density. A complete system including the TCP/IP stack fits in under 8K bytes.
       Single cycle call, zero cycle return
       Instruction set maps trivially to Forth
       Cross compiler runs on Windows, Mac and Unix
       Basic software includes a sizeable subset of ANS Forth and a portable TCP/IP networking stack.

Interesting information about ssh{d} on Ubuntu touch.

The blog has a number of articles related to Emacs, Org mode, Go.

Blog entry about changing some settings for ediff, the file compare tool of the Emacs editor.
Investigate the csetq macro, see also the alternative customize-set-variable suggested in the comments.

Small as a mouse, fast as a cheetah and available for free. NetSurf is a multi-platform web browser for RISC OS, UNIX-like platforms (including Linux), Mac OS X, and more.