Atmel AVR Studio 4:
AVR Studio 4 is an IDE, launched by atmel for providing better programming envoinment. It can be used to program all the famous series of atmel i.e. Attiny , Atmega, Xmega . The envoivromnet is very user-friendly. Under given is the welcome screen view for the atmel avr 4 which is available free to download.
AVR Studio 4, is highly recommended for all types of projects, which is available free to download. It provides color based text editor, intterupts, timers/counters, variable values.
Under given is its link to download.