FT2232d USB To Serial Port USB To I2C Schematic And Pcb USB To SPI Usb Iic Usp Spi Usb I2C FT2232 USBto Dual Serial Port Sch And Pcb From Supersun521, $4.31
USB<->I2C interface using a RAVAR MOD4 module
USB I2C module from KEL on Tindie
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USB RTC for Raspberry Pi : Time is in your Hands Now!!! by Amrit Singh — Kickstarter
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Devantech USB to I2C Module
Ftdi Ft260 Usb I2c Converter I2c Usb Adapter Board - Pc Hardware Cables & Adapters - AliExpress
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USB-ISS-SV - Enhanced USB-I2C Module , from Devantech for €22.47
USB-I2C/IO (Rev. C1)
USB-ISS - Enhanced USB-I2C Module
Arducam Usb3.0 Camera Shield Plus - Demo Board - AliExpress
DSX Tech – Page 2 – DSX Tuning
I2CMini is tiny USB to I2C Bridge for your PC or SBC (Crowdfunding) - CNX Software
DLN-2 USB-I2C/SPI/GPIO Adapter
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USB-I2C/SPI/GPIO/PWM/ADC Interface | $19.10 to $89.40