Programmer for the tinyAVR family based on the cheap Chinese CH340 converter / Sudo Null IT News
ATmega UPDI Programmer SMD - EasyEDA
Cheap AVR UPDI Programmer from ATtiny817 Xplained Mini – Wired && Coded;
External UPDI Programmer for AVR-IoT WG Board - Hackster.io
Mini UPDI Programmer Stick | Hackaday.io
Technoblogy - UPDI Programmer Stick
Atmel-ICE
BASCOM-AVR
Create Your Own UPDI Programmer - Arduino Project Hub
GitHub - MCUdude/microUPDI: DIY UPDI programmer with open source hardware!
AVR UPDI Programmer with 12V from LeoNerd's Store on Tindie
Create Your Own UPDI Programmer - Arduino Project Hub
Can't even communicate with ATtiny402 via MPLAB Snap? : avr
ATmega UPDI Programmer SMD - EasyEDA
UPDI programmer compatible with Arduino IDE - Electronics-Lab.com
Connecting Atmel ICE to a UPDI Target - Developer Help
FTDI / UPDI connector
UPDI interface with Attiny3217 isn't working | AVR Freaks
A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
UPDI programmer for ATmega4809 and ATtiny816/817 | Elektor Magazine
UPDI programmer software for Arduino - compatible with avrdude | AVR Freaks