Programs for several HP calculators to calculate many digits of π.

Found when searching for HP 5384A Universal Counter

Found on the Raspberry pi blog https://www.raspberrypi.com/news/got-a-raspberry-pi-for-christmas-welcome-to-the-family/

It includes bindings to OpenGL and examples of the Raspberry π Pico https://pico-doc.synack.me/. Found after https://calculator-scripts.sourceforge.io/hp41cx-tools/encoder/ has been announced of the MoHP forum https://www.hpmuseum.org/forum/thread-22732-post-210728.html#pid210728

On-demand native compilation uses too many resources on a Raspberry π 0. Found on Sacha Chua's blog https://sachachua.com/blog/2025/06/2025-06-09-emacs-news/

This website serves pi and interactive demos that you can listen to or see pi with. It does not provide a search function.
Found on http://www.numberworld.org/y-cruncher/faq.html#download_digits, which wisely warns "But this is likely to be temporary."

The statement "I've found that Aberth performs worse [than Weierstrass-Durand-Kerner] on most examples as its faster convergence is offset by the slower evaluation." is interesting.
Fredrik Johansson is the author of https://mpmath.org/, https://arblib.org/ and https://flintlib.org/ arbitrary-precision libraries and of the Mathematical Functions Grimoire https://fungrim.org/
https://flintlib.org/doc/examples_arb.html#pi-c has an example where π is calculated to 10^6 digits.

BBOS provides a command line interface (or CLI) that lets you interface with the RP2040 board directly. This makes it possible to not only interact with the Pi but also handle practical functions like real-time debugging. https://github.com/mcknly/breadboard-os

The 'Azure RTOS' used in millions of Raspberry Pis is now FOSS

Neo6502 is small computer with USB keyboard host and HDMI/DVI output.
Found on https://fosdem.org/2024/schedule/event/fosdem-2024-2093-neo6502-in-the-matrix-open-source-hardware-and-software-modern-retro-computer-with-software-defined-architecture/