$5 CH347 board is a USB 2.0 bridge to I2C, SPI, UART, JTAG, and GPIO - CNX Software
USB SPI click - Breakout board for MCP2210 USB to SPI converter
Buy FT232H - USB converter for UART, SPI, I2C Botland - Robotic Shop
Amazon.com: USB to JTAG UART Module, USB to Serial Port Module, High Speed USB to JTAG UART/FIFO SPI/I2C, Multifunction USB to FIFO SPI/I2C Module, with 3Pin Header : Electronics
CP2112 Classic USB to UART Bridge - Silicon Labs
Development Board Open Source | Usb Spi Development Board | Development Board Module - Demo Board - Aliexpress
I2C to SPI Click | Mikroe
UMFT4222EV-D FTDI, Future Technology Devices International Ltd | Development Boards, Kits, Programmers | DigiKey
Amazon.com: waveshare CP2102 USB-C to UART (TTL) Communication Module, USB-Type C Connector,Compatible with 3.3V Logic Level, Support Linux, Android, Wince, Windows 7/8/10/11,ect : Everything Else
Total Phase Aardvark I2C/SPI Host Adapter - USB to I2C/SPI Bridge | eBay
Devantech USB to UART, I2C, SPI, serial adapter (USB-ISS) | Acroname
EVE2 USB to SPI Bridge - YouTube
SPI to 4 X UART Bridge (MULTIUART) : 6 Steps - Instructables
DK-USB-SPI-10225-1A Qualcomm | Development Boards, Kits, Programmers | DigiKey
CH347 Development Board Module USB2.0 High Speed USB to UART / I2C / SPI / JTAG / GPIO Open Source USB-HS-Bridge
Pololu USB-to-Serial Adapter
CY7C65211A-24LTXIT - Infineon - USB TO I2C/SPI/UART BRIDGE, 85DEG C ROHS COMPLIANT: YES
EVE2-USB2SPI-KIT-A, FT232H
FT220XQ - FTDI
MCP2210-I/SO Microchip | Microchip USB to SPI Bridge 20-Pin SOIC, MCP2210-I/SO | 761-7204 | RS Components