Amazon.com: WITMOTION USB-UART 6-in-1 USB to Serial Converter, Multifunctional (USB to TTL/RS485/232, TTL-RS232/485, 232 to 485), Universal Adapter Module with CP2102 Compatible with Windows 7/8/10,Linux, Arduino : Electronics
CH340G CH340 USB TTL Serial Adapter UART FTDI Router Upgrade ESP8266 Arduino | eBay
Adafruit - USB to TTL Serial Cable - Debug / Console Cable for Victor BB / Raspberry P - Adafruit 954i #954-PL2303
USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi : ID 954 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: USB to TTL Adapter, USB to Serial Converter for Development Projects - Featuring Genuine FTDI USB UART IC 'FT232RL' : Electronics
USB to RS232 TTL | CMOS Adapter Cable with Terminal Block
WitMotion USB to TTL RS485 RS232 Multi-function Serial Interface Module 3.3v and 5v input Serial converter
FTDI TTL-232R-3V3 USB to TC2030 Debug Cable | Tag-Connect
USB to TTL serial cable - CP2102 | Kiwi Electronics