A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
mikroProg for Atmel AVR (AT90, ATmega, ATtiny) - MikroElektronika
AVR Programming Interface PCB ONLY
Pololu USB AVR Programmer v2.1
USB AVR ISP (In-System-Programmer)
AVR Programmer - ABDien
AVR Programming - AVR Studio Tutorial Introduction - YouTube