An alternative Pi Pico 2 (RP2350) type board you can have made yourself.

A device for twiddling the mouse optically

Multi Tasking OS for Apple IIe //c IIgs

fldigi repository with SCAMP

A Raspberry Pi Pico miniature synth keyboard inspired by analog keyboard with analog controls and MIDI

PicoMEM Doc and Firmware

An alternative Pi Pico type board you can have made yourself.

A guitar effects processor based on the Raspberry Pi Pico

Minimal piano sound module with dynamics based on Arduino and WAV Trigger

Open singing synthesis platform / Open source UTAU successor

guitar effects processor implemented on various arm cortex platforms

A self-hosted Ada-inspired programming language for very small systems.

A SI5351A based PLL with the option to add a TCXO

Minetest is an open source voxel game-creation platform with easy modding and game creation

Apple II Peripheral Card that Interfaces to a ATMEGA328P for SD card storage

VGA/TV display on Raspberry Pico (Linux/cmake)

A QRP digital transceiver created from readily available parts for off-the-grid maintenance

Open firmware for all versions of the uSDX transceiver

Civilizational Bootstraper: landing page and wiki

A super simple, super cheap all-mode QRP transceiver

A Schottky RF noise source based on the BAT17 diode

A bunch of useful FreeCAD parametric models I've designed

A panel for illuminating a decorating display from below with options for size and layout

A full-featured CW keyer for amateur radio use. The keyer is built around a cheap and tiny ATTINY85 microcontroller. The circuit boasts 4-100 character memories, beacon mode, multiple timing option…

A "Blue Box" design that emulates classic Blue Box tones, plus 12 other historical, tone modes

Scriptable cross-platform data terminal which supports: serial port, UDP, TCP, SPI, I2C and CAN.

An adjustable T Match where the capacitors and inductors are on the PCB.

A customizable HID USB device with buttons, encoders, sliders, potentiometers, etc.