ESP8266 / ESP32 programmer USB-TTL adapter from ClimateGuard on Tindie
Amazon.com: USB to TTL Serial Converter, CH343G USB to TTL Adapter with Cable, Universal USB to TTL Serial Adapter Cable Serial Communication Module : Electronics
Multi USB/RS232/RS485/TTL Converter
Industrial USB TO TTL Converter, Original FT232RL Onboard, Multi Protection Circuits, Multi Systems Support