The program is used as GUI for AVRDUDE. AVRDUDE is tool for programming microcontrollers by atmel (atmega, attiny, at90can/usb, atxmega etc).
The program supports a lot of programmers for example Arduino, Atmel AVR Dragon, STK500,600,200, USBAsp or The Bus Pirate. The program able to reading and writting fuses and load code to FLASH and EEPROM. The program is multiplatform (Linux, Windows and Mac OS X). If you run the program on Linux or Mac OS X, you have to the program runs with MONO.