Tomu: A Microcontroller For Your USB Port | Hackaday
USB Connectivity for MCUs: Which is Right for Your Next Design? | DigiKey
CH559 USB MCU Mini DEV Board [CH55x Series] – ElectroDragon
Amazon.com: Aihjcnele Attiny85 Digispark Kickstarter USB Module Development Board Compatible IDE for Arduino General Micro USB MCU Development Module Compatible with UNO R3 PWM I2C SPI ADC I/O with Cable Wire :
CH375 USB Module USB Interface Communication Module Reader Adapter for MCU DSP MPU
Amazon.com: Compatible Atmel AT AVRISP mkII AVR ISP mk2 USB MCU AVR XMEGA In-System Programmer Studio 4/5/6 ISP PDI interface @XYGStudy : Electronics
YEUHTLL Virtual keyboard Badusb Leonardo R3 USB ATMEGA32U4 MCU USB Microcontroller - Walmart.com
USB iNode MCU USB microcontroller - NodeMCU ESP32 Botland - Robotic Shop
usb device - USB Full Speed driver with MCU in DIP package - Electrical Engineering Stack Exchange
CH552 CH554 USB MCU Mini DEV Board [CH55x Series] – ElectroDragon
U-ec6 Usb Debug Adapter For C8051f Mcu Compatible With Ec3/ec5 Usb Emulator Downloader Programmer With Usb Cable Jtag Line - Instrument Parts & Accessories - AliExpress
WCH CH552G E8051 8-BIT USB MCU SOIC16 from Rabid's Electronics Emporium on Tindie
Amazon.com: BIT-C Pro Micro MCU with USB-C & DFU bootloader (ATmega32U4, 5V/16MHz) (Black) : Electronics
TC2050-PGUSB MCU USB debug connector - legged | Tag-Connect