Arduino Nano Atmega168 compatible CH340C USB microcontroller development board
emPower-USB-Host low-cost dev board carries two USB host ports
Buy PIC18F2550 flash USB Microcontroller DIP 28 pin IC
Pro Micro USB ATMEGA32U4 5V Microcontroller Module 16M Replace ATmega328 For Arduino System Develop Program Debugger Emulator|Integrated Circuits| - AliExpress
ATmega32U4 8-bit MCU with USB Controller - Microchip Technology | Mouser
Amazon.com: for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro Geekstory : Electronics