Found via the COFF mailing list.

I’m Tomu, a tiny ARM microprocessor which fits in your USB port. I have two buttons and two LEDs!
I’m fully open source and am buildable by hobbyists! Designed for 2-factor authentication, USB experiments, or anything else you can think of.
Can be used as U2F/FIDO authenticator, but has no AES hardware accelerator.

This is a collection of links
https://candykeys.com/product/vortex-tab90M-ansi
https://www.duckychannel.com.tw/en/about
https://www.mechanical-keyboard.org/de/mechanische-tastaturen-im-test/
https://www.mechanical-keyboard.org/de/mechanische-tastaturen-uebersicht/
https://www.tomshardware.com/best-picks/best-budget-mechanical-keyboards
https://www.alternate.at/Mechanische-Tastaturen?s=default&filter_2147482727=920&filter_2147482745=903/
https://www.wasdkeyboards.com/products/accessories/switch-tester.html
https://deskthority.net/wiki/Main_Page
http://global.leopold.co.kr/Shop/Item.php?ItId=1550022047
https://www.pcgamingrace.com/products/glorious-gmmk-pro-75-barebone-black-reservation

Up to 4 CM4 modules with lots of interfaces, found on
https://www.raspberrypi.org/blog/raspberry-pi-compute-module-4/

Interesting software, such as
unifdef selectively removes C preprocessor conditionals. My version of this program now shipped by all the BSDs (including Mac OS X) and is used by the Linux kernel build system.
regpg safely stores server secrets using gpg, so you can keep them in version control.
picoro - tiny coroutine implementations in pure C. I wrote an accompanying article, coroutines in 20 lines of standard C.
Counting the days - tiny routines for converting Gregorian dates into linear counts, like Julian day numbers or Unix time_t. The date of the count - a small routine for converting linear day counts into Gregorian dates.
https://dotat.at/@/2016-04-22-synergy-vs-xmodmap-fight.html Why you can't use xmodmap to change how Synergy handles modifier keys
https://dotat.at/@/2023-05-26-whence-time.html Where does my computer get the time from?
https://dotat.at/@/2023-08-04-unix69.html a neat keyboard map
https://dotat.at/@/2024-01-29-four-point-egg.html construct an egg shape with straightedge and compass
His log of links, https://dotat.at/:/ which I found on the TUHS mailing list is also worth reading. He explains a bit about this log on http://dotat.at/.

Filestash (formerly nuage) is a web client for org-mode. It started as its author believe emacs and org-mode are the greatest thing since sliced bread. The project aims to fix the pain points org-mode's users may have:
- emacs isn't great out of the desktop world, it needs a cross platform companion app
- not everyone is willing to go through learning emacs which makes org-mode a hard to sell tool to manage team project.

A positive review can be found on https://nixfaq.org/2020/06/filestash-a-drag-and-drop-gui-for-file-management-on-server.html

See https://www.filestash.app/2021/09/06/android-backup/ for a neat way to backup photos from an Android phone.

CurrentRanger is a nanoAmp current meter featuring auto-ranging, uni/bi-directional modes, Bluetooth data logging options and more.

It is a highly hackable and affordable ultra low-burden-voltage ammeter, appropriate for hobby and professional use where capturing fast current transients and measurement precision are important.

A very lightweight representation of the venerable Apollo DSKY. Uses a Touch LCD to bypass all the hardware complexity.

Found via a comment in the Raspberry π forum.