USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi : ID 954 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
CH341T module USB to I2C IIC UART USB to TTL single-chip serial port downloader | eBay
USB UART 2 click - provides USB isolation | MikroElektronika
CP2104 Classic USB to UART Bridge - Silicon Labs
USB to Serial UART 5V TTL Header Cable, UART Interface
Prolific Usb To Serial Comm Port Usb2.0 Rs232 Adapter Cable Plc Cpu Mcu Firmware Update Flash Debug Wire - Pc Hardware Cables & Adapters - AliExpress
USB-UART 2 Module Kit – ODROID
DEBO USB2UART 2: Developer boards - USB type-A to UART, CP2102 at reichelt elektronik
Amazon.com: Feanteek USB to TTL Cable Adapter Uart USB Converter FTDI USB Serial Cable for Raspberry PI Debug Windows 10 : Electronics
Amazon.com: WITMOTION USB-UART Converter 3-in-1 Multifunctional(USB to TTL/ USB to RS232/ USB to RS485) 3.3-5V Serial Adapter, with CH340 chip Compatible with Windows 7,8,Linux,Arduino for Development Projects : Electronics
SparkFun USB UART Serial Breakout - CY7C65213 - BOB-13830 - SparkFun Electronics
USB 2.0 to TTL UART 6-Pin Serial Converter(CP2102) from BurgessWorld Custom Electronics on Tindie
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,
FTDI USB to TTL UART Adapter - Reliable SD cards for industrial Raspberry Pi
μArt USB-UART Converter - Signoid | Mouser
USB UART Adapter for Autoquad and Multiwii | Flyduino