Not only older issues of the Numerical Recipes books, but also classics such as
Handbook Abramowitz and Stegun, Handbook of Mathematical Functions (10th corrected printing, 1972)
Bateman, Erdelyi et al. (Bateman Manuscript Project)
Higher Transcendental Functions (vols. 1, 2, and 3)
and
Encyclopaedia Britannica the great 11th Edition (1911)
The personal website of Piers Cawley
— baker/owner of The Loafery, folk singer and photographer. Found via Sacha Chua's page, because he uses Emacs and PostgresSQL to manage his bakery https://bofh.org.uk/2019/02/25/baking-with-emacs/
but the articles about Turing look interesting too.
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)."
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.
Klipse https://github.com/viebel/klipse
allows to interactively edit and run programs written in
Common Lisp, javascript, clojure[script], python, brainfuck, scheme
in a Javascript-enabled web browser.
Ironically, it does not seem to work with Firefox 52.6.0 (64-bit)/Windows 7.