It is a Forth (why Forth?) operating system and a collection of tools and documentation with a single purpose: preserve the ability to program microcontrollers through civilizational collapse. Found via Michael Schierl's port https://github.com/schierlm/collapseos-uxn

Alternatives for many services, for example http://k5n.us/wp/webcalendar/

Mentioned on the Oberon mailing list https://lists.inf.ethz.ch/pipermail/oberon/2022/016530.html

An implementation of ANSI Common Lisp written in C.
If I find the time, I would like to find answers which allow to add information to the table on https://www.cliki.net/Common%20Lisp%20implementation

PTP time on a Raspberry Pi CM 4. Note that the Rpi 5 also has PTP support.
See also https://www.jeffgeerling.com/blog/2022/ptp-and-ieee-1588-hardware-timestamping-on-raspberry-pi-cm4
https://store.timebeat.app/collections/timecard-mini
He mentioned another time-related HAT on his video https://m.youtube.com/watch?v=RvnG-ywF6_s

https://www.jeffgeerling.com/blog/2023/build-your-own-private-wireguard-vpn-pivpn is interesting too.

The SLURM Workload Manager is an open source, fault-tolerant and highly scalable cluster management and job scheduling system[1] used on the DEAC cluster. Formerly known as Simple Linux Utility for Resource Management (aka SLURM)[2], it provides three key functions:

Allocates exclusive and/or non-exclusive access to resources (compute nodes) to users for X period of time
Provides a framework for starting, executing, and monitoring work on allocated nodes
Arbitrates contention for resources by managing a queue of pending jobs

See also https://wiki.deac.wfu.edu/user/Software:OpenPFGW a primality test program

Portable and heterogeneously-accelerated graphical visualization for radio signals.
Features
🦑 Meant to be extremely portable (NVIDIA, Apple M1/M2, Raspberry Pi, AMD).
🖼️ Meant to support the most common heterogeneous APIs (CUDA, Vulkan, Metal, WebGPU).
🔋 Runtime configurable hardware accelerated heterogeneous computing.
🧳 Compatible with GNU Radio with gr-cyber.
Found on https://www.rtl-sdr.com/rfnm-now-available-for-pre-order/

See also the PiSDR image, an MIT-licensed distribution for the raspberry π from the same author https://github.com/luigifcruz/pisdr-image

Web-based 3D drawing program.

Free and proprietary tools to de- and encode ASN.1 formatted data.

A simple direct sampling software defined radio, with a bandwidth of 250 kHz using the Raspberry Pi Pico.