IAN CANADA BridgePi Adapter USB Interface to GPIO - Audiophonics
SparkFun USB to Serial GPIO Breakout - CP2103 - BOB-00199 - SparkFun Electronics
16 Channel USB GPIO Module With Analog Inputs | Numato Lab
Sinelec Technologies
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
DLN-2 USB-I2C/SPI/GPIO Adapter
Amazon.com: NUMATO LAB 64 Channel USB GPIO Module with Analog Inputs : Electronics
8 Channel USB GPIO Module With Analog Inputs
Amazon.com: 8 Channel USB GPIO Module with Analog Inputs
Cerevo FlexTally GPIO/USB Converter for Select CDP-FT01-VMON B&H
USB-TO-GPIO Texas Instruments | Mouser
Adafruit FT232H Breakout - General Purpose USB to GPIO+SPI+I2C
GIGAIPC
General-Purpose Input/Output USB RS232 Adapter | Black Box
128 Channel USB GPIO Module With Analog Inputs – Dolphin Labs Store
Amazon.com: 32 Channel USB GPIO Module with Analog Inputs : Electronics
8 Channel USB GPIO Module With Analog Inputs | Numato Lab
64 Channel USB GPIO Module With Analog Inputs | Numato Lab
Numato 32 Channel USB GPIO Module | AltonaLab
USB-TO-GPIO2 Evaluation board | TI.com
Numato and Pi Supply generic USB GPIO boards
SparkFun USB to Serial GPIO Breakout - CP2103 - BOB-00199 - SparkFun Electronics