Atmel Studio® (free Atmel IDE) - The Atmel Studio is the programming/debug platform.
Atmel AVR ONE!(on-chip programming and debugging tool). AVRONE! is a high-end debug/programming tool that can be used for code development with the RZ600 kit.
Atmel AVR JTAGICE mkII(on-chip programming and debugging tool). AVR JTAGICE mkII is a mid-end debug/programming tool that can be used for code development with the RZ600 kit.
AVR Software FrameworkThe API for tool and application development on the AVR platform
Atmel FLIP(Flexible In-system Programmer) - BatchISP(FLIP) is a command line tool for programming the flash and EEPROM memories of the AVR and is part of the FLIP installation. It can be used to communicate with the preprogrammed USB DFU bootloader.
IAR Embedded Workbench® for Atmel AVR. This is a commercial C/C++ compiler that is available for 8-bit AVR. There is a 30 day evaluation version as well as a 4k (code size limited) kick-start version available from their website.