The author, Michael Schierl writes:
"Here you can find modifications (I deliberately do not call them enhancements) I did to Project Oberon 2013."

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

Inspired by the classics. Compatible with Windows 10(1903) or above, and Android 9.0 or above.
Connnect via Bluetooth, wireless 2.4G, or wired.
87-key layout. Kailh Box Switch V2 White. Dye-sub PBT keycaps.
Top mount style. Hot-swappable PCB. Support n-key rollover.
Dual Super Buttons - offer large, programmable keys. Map anything to the Super Buttons instantly without using software.
Classic power status LED, with independent control panel.
Supports 8BitDo Ultimate Software V2 for custom keyboard mapping. (Release in September 2023.)

Found via a link from the Raspberry π blog
https://www.raspberrypi.com/news/raspberry-pi-5-and-retro-gaming-with-spanish-reviewer-marc/

Greaseweazle allows versatile floppy drive control over USB. Read and write your vintage floppy disks from your PC/Linux/Mac computer. This USB device lets you to connect an old floppy disk drive to your modern computer to read/write floppy disks from any system with Shugart standard drives (Amiga, Atarí, Commodore, Amstrad, Sinclair, PC, CNC machines, musical instruments, industrial equipment, and more.)

By extracting the raw flux transitions from a drive, any disk format can be captured and analyzed. The Greaseweazle also supports writing to floppy disks, from a range of image file formats including those commonly used for online preservation (ADF, IPF, DSK, IMG, HFE, …).

Greaseweazle V4 is the latest version, updated for mass production and with the following features:

Reads and writes 3″, 3.5″, 5.25″, 8″ disks (with suitable drive and cable)
Buffered outputs, for communicating with older 5.25″ and 8″ disk drives
Integrated power connector for directly powering most 3.5″ disk drives
Write-enable jumper can be removed for safer preservation of precious vintage disks
Supports floppy-modded 5.25″ drives
Supports Disk-Change detection as used by Rob Smith’s integration into the WinUAE Amiga emulator
3 user-definable outputs (eg. 8″ interface REDWC signal)
100% factory tested, and tested again by me before shipping

Found via https://www.tuhs.org/pipermail/tuhs/2023-January/027510.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

Found via https://ochicken.net/projects/workspace/
https://andreyor.st/posts/2022-02-22-new-look/ could be useful for my own blog, if I ever start it.

Found in c't 2023-10 (TBC).
See also https://passkey.org/ which was mentioned in the same article.

Description of many different knots. Found via Paul Lutus' page https://arachnoid.com/rope_climbing_101/index.html

Description of Org’s new native citation syntax.
Found on https://github.com/vikasrawal/orgpaper/blob/master/orgpapers.org which mentions that org-mode newer than 9.5 is needed for this feature.