The Atmel AVR® STK500 is a starter kit and development system for Atmel's AVR Flash microcontrollers. The STK500 gives designers a quick start to develop code on the AVR combined with features for using the starter kit to develop prototypes and test new designs. The STK500 interfaces with AVR Studio®, Atmel's Integrated Development Environment (IDE) for code writing and debugging.
Expansion cards are available for the different AVR sub-families and larger devices.
The AVR Studio online-help contains the most current information and a complete list of supported devices