USB 2.0 to TTL UART 6-Pin Serial Converter(CP2102) from BurgessWorld Custom Electronics on Tindie
Amazon.com: USB to TTL Serial 3.3V UART Converter Cable with FTDI Chip Terminated by 6 Way Header, Works with Galileo Gen2 Boards/BeagleBone Black/Minnowboard Max and More : Electronics
Steg USB-UART Pmod™ Compatible Module – Machdyne
USB UART 4 click - USB-to-UART interface module | MikroElektronika