Microcontrollers with USB interface are common, but… | FTDI
CH551 is a $1.80 USB Mini Development board based on the 8-bit C51 micro-controller - Electronics-Lab.com
6.90.00 emPower USB Host Board - Segger | Mouser
PropStick USB
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PL2303 USB to TTL/USB-TTL/STC Converter Microcontroller Programmer
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Pololu USB-to-Serial Adapter
Waveshare RP2040-Tiny Development Board, Raspberry Pi Microcontroller Development Board, Based On Official RP2040 Dual Core Processor, USB Port Adapter Board Optional
Ch552g Development Board / Core Board 8051 Usb Microcontroller Ch551g / Ch552g / Ch554g Wch - Demo Board - AliExpress
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Amazon.com: ciciglow RP2040 Microcontroller with USB A Male Port, Dual Core 264KB 2M Flash Development Kit with Rich Interfaces, Support for C, for Python Development : Electronics