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

Found on https://www.theregister.com/2023/02/09/balthazar_free_hardware_laptop/

Completely open hardware and open-source firmware. N-Key rollover: Diodes on every keyswitch prevent ghosting. Controller: ATmega32U4 with open source firmware based on LUFA. Easy to update via USB.

Now also supported by the popular QMK firmware.

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.

Software runs on Linux, Android, OS X, iOS and Windows.

Prototype of a translator from a python-like syntax to C. Found via
https://www.jwz.org/blog/2017/04/python-has-a-lot-to-fucking-answer-for/#comments

On http://xed.ch/help/, a number of useful personal technical notes can be found.

For example, http://xed.ch/help/usbdrive.html describes how to create bootable USB drives.

From the author:
"I was looking for a simple way to backup data on Android devices directly to a device running GNU/Linux connected over a USB cable (in my case, a desktop computer).

Is this really so unique that it’s worth writing a new article about it? Well, in my case, I did not want to buffer the data on any “intermediate” devices such as storage cards connected via microSD or USB-OTG. Also, I did not want to use any proprietary tools or formats. Instead, I wanted to store my backups in “oldschool” formats such as dd-images or tar archives. I did not find a comprehensive howto for that, so I decided to write this article."

piShift makes it super simple to get programming on your Pi Zero – just plug your Pi into your laptop with a micro-USB cable and it appears as a USB Drive. Drag across a .py file, and within seconds the Pi will automatically detect it’s been added, and will start running the most recently edited file.

V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.

USB oscilloscope, logic analyser, waveform & pattern generator.

A Libre * Design, Minimalist, Ergonomic, Splittable, Symmetric, Compact 64 Keys, Eco-Friendly, Durable, Native Colemak Keyboard, Embedded Mouse and Firmware Programmable USB Keyboard.