USB to TTL PL2303HX Module Serial Port Downloader Module KEYES for Arduino - products that work with official Arduino boards
Nettigo: USB/Serial converter [Arduino A000059]
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
Amazon.com: Geekstory CP2102 6 in 1 USB-UART Serial Adapter Module USB to TTL 485 232,TTL to 232 485,RS232 to 485 + 4P Dupont Cable Jumper Wire Female to Female, for Windows, Linux,
Arduino Serial : 8 Steps - Instructables
CH340G Serial Port Debugger USB To TTL Converter Adapter Module
FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module for Arduino Mini Port | eBay
Arduino USB-to-Serial Tutorial - Programming the Pro Mini - YouTube
Amazon.com: Cylewet 2Pcs FT232RL 3.3V 5.5V Module USB to TTL Serial Adapter Module for Arduino Mini Port USB to Serial Interface Module (Pack of 2) CYT1007 : Electronics
Ch340 Serial Port Debugger Usb To Ttl Converter Ch340 Module Stc Download Cable Adapter For Pro Mini Board And For Arduino - Industrial Computer & Accessories - AliExpress
USB/serial converter WITHOUT headers | Arduino | Studica
Arduino USB 2 Serial Micro | Arduino Documentation | Arduino Documentation
Diymore Cp2102 Usb 2.0 To Ttl Uart Module 6 Pin Serial Converter Stc Replace Ft232 Adapter Module For Arduino 3.3v/5v - Integrated Circuits - AliExpress
How to Use Arduino as USB to Serial Converter | Microcontroller Tutorials
PL2303 USB Serial USB TTL RS232 PL2303HX Module Arduino PIC Converter | eBay