AngstromIO, one of the smallest devboards out there, barely longer than a USB C connector, based on the Attiny1616 MCU. And a dual CH340 board for programming and debugging, and another devboard, based on the CH32V003
The Seeed Studio XIAO Series is a collection of thumb-sized, powerful microcontroller units (MCUs) tailor-made for space-conscious projects requiring high performance and wireless connectivity.
CodeCell is a family of tiny boards that help you miniaturize your DIY robots, wearables, and IoT projects with ease! Designed for makers, each CodeCell features an Arduino-compatible ESP32 microcontroller, onboard sensors, and smart power management - all programmable over a standard USB-C cable.