AVR Studio® 4

AVR Studio® 4 is the new professional Integrated Development Environment (IDE) for writing and debugging AVR® applications in Windows® 9x/NT/2000/XP environments.

AVR Studio 4 includes an assembler and a simulator. The following AVR development tools are also supported:
ICE50, ICE40, JTAGICE mkII, JTAGICE, ICE200, STK500/501/502/503/504/505/520, AVRISP mkII, and AVRISP.