Create Your Own UPDI Programmer - Arduino Project Hub
Atmel-ICE
Technoblogy - UPDI Programmer Stick
A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
Tiny Core AVR UPDI Programmer from TinyStore on Tindie