This theme was mentioned on https://www.reddit.com/r/emacs/comments/1czgb5f/acmetheme_is_just_so_pleasant_to_look_at/ which I found on Sacha Chua's blog https://sachachua.com/blog/2024/05/2024-05-27-emacs-news/
https://github.com/ianyepan/acme-emacs-theme

The references look interesting.

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

unsurv offline is a privacy friendly, small and lightweight PCB (45 mm x 32 mm) based on an ESP32 featuring a high quality GNSS receiver, accelerometer, and NFC capabilities. Using a combination of onboard features and OpenStreetMap (OSM) data, unsurv offline helps you collect and analyze location data in a privacy-friendly way. Originally conceived to better understand offline video surveillance, this fully open source project is here to help you find and develop a variety of custom use cases.

Project using the camera of Android or iOS phones to detect cosmic rays.

M_Map is a set of mapping tools written for Matlab (it also works under Octave). M_Map includes:
1. Routines to project data in 21 different projections (and determine inverse mappings), using spherical and ellipsoidal earth-models.
2. A grid generation routine to make nice axes with limits either in lat/long terms or in planar X/Y terms.
3. A coastline database (with 1/4 degree resolution).
4. A global elevation database (1 degree resolution).
Hooks into freely available high-resolution coastline and bathymetry databases.
5. Other useful stuff.

I have not found out which license is used.

This repo is an implementation the Plan 9 cpu command, both client and server, for Linux. More detail is available in the CPU chapter of the LinuxBoot book. https://book.linuxboot.org/cpu/
Unlike the Plan 9 command, this version uses the ssh protocol for the underlying transport. It includes features familiar to ssh users, such as support for the ssh config file.

The cpu command lets you log in from a local system to a remote system and see some or all of the files (how much is up to you) from the local system.

This is wonderfully convenient for embedded systems programmers. Because some or all the files can come from your local machine, including binaries, the only thing you need installed on the remote machine is the cpu daemon itself.

In this release, the following calculators are simulated:
Classic series:    35, 45, 55, 80
Woodstock series:  21, 22, 25, 27
Spice series:      31E, 33C, 34C, 37E, 38E, 38C
Nut series:        41CV, 41CX
Voyager series:    11C, 12C, 15C, 16C

Modified Voyager:  15X (more RAM)

See also Eric Smith's page https://nonpareil.brouhaha.com/

The PX5 RTOS is ULTRASMALL (< 1KB for minimal use), enabling its use in some of the most memory-constrained devices. It is one of the smallest RTOSes available, requiring less than 1KB of FLASH and 1KB of RAM on typical 32-bit microcontrollers. I have not found out how it is licensed.
The company also offers https://px5rtos.com/px5-net/, a TCP/IP implementation.

Found on https://www.theregister.com/2023/11/28/microsoft_opens_sources_threadx/

Found on http://xahlee.info/emacs/misc/rms_emacs_tyrant_2018-03.html