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 (BETA) Builders' Notes
Wiznet Ethernet Chip Design Guide - Hackster.io
AxiCat
USB-I2C Communications Module
USB-ISS - Enhanced USB-I2C Module
USB I2C module from KEL on Tindie
Buy DEV BOARD, FT201XB USB-I2C, PCB UMFT201XB-NC By FTDI Online at desertcartKUWAIT
Devantech USB to I2C Module
USB RTC for Raspberry Pi : Time is in your Hands Now!!! by Amrit Singh — Kickstarter
Smart BMS adapter
USB-I2C/SPI/GPIO/PWM/ADC Interface | $19.10 to $89.40