Download ((free)) Avr Studio 4 -

AVR Studio 4 is an integrated development environment (IDE) created by Atmel (now part of Microchip Technology) for developing and debugging embedded applications based on Atmel AVR microcontrollers. First released in the early 2000s, version 4 became a staple for hobbyists and professionals working with classic AVR chips like the ATmega328 (found in Arduino Uno), ATtiny series, and ATmega2560.