Attiny2313a-pu Usbtiny Usbtinyisp Avr Isp Programmer Bootloader For Arduino Ide Meag2560 Uno R3 With 10pin Programming Cable One - Integrated Circuits - AliExpress
Pololu USB AVR Programmer v2.1
Amazon.com: HiLetgo USBTiny USBtinyISP AVR ISP Programmer 6/10 Pin Bootloader for Arduino UNO MEGA : Electronics
DIY USBtinyISP-compatible AVR programmer
Atmega Programming With USBtinyISP and Arduino - Instructables