Adafruit FT232H Breakout - General Purpose USB to GPIO, SPI, I2C [USB C & Stemma QT] : ID 2264 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
MCP2210-I/MQ by Microchip USB Bridges | Avnet
USB to SPI Bridge And Bootstrap Loader (video) - Geeky Gadgets
UMFT4222EV-D FTDI, Future Technology Devices International Ltd | Development Boards, Kits, Programmers | DigiKey
Ch341a Usb To I2c / Iic / Spi / Uart / Ttl / Isp Adapter Epp / Mem Parallel Port Converter - Contactors - AliExpress
MCP2210-I/SS - Microchip - USB Interface, USB-SPI Protocol Converter, USB 2.0
SPI To USB Bridge IC
Devantech USB to UART, I2C, SPI, serial adapter (USB-ISS) | Acroname
EVE2 USB to SPI Bridge - YouTube
Yocto-SPI - USB to SPI adapter (TTL 3.3V or 5V), driver-free
EVE USB to SPI Bridge
CSR "Babelfish" USB-SPI 1324 Converter
Amazon.com: All in 1 USB for ISP Serial Adapter Converters SPI/I2C/IIC/UART/TTL : Electronics
Cjmcu-220 Interface Development Tools Usb To Spi/ft1248 Breakout Brd Ft220x Umft220xb Usb 4-bit Ic - Integrated Circuits - AliExpress
USB-SPI Adapters
Wch341a Programmer Usb To Uart Iic Spi I2c Convertor Parallel Port Converter Onboard Operating Indicator Lamp Board Module - Integrated Circuits - AliExpress
CSR USB SPI Programmer,USB-to-SPI Converter For Debug Manufacturers and Suppliers - Wholesale Products - FEASYCOM
FT4222HQ - FTDI
DLN-2C USB-I2C/SPI/GPIO Interface (system on chip)