avarice

Atmel AVR JTAG programmer and debugging interface for avr-gdb

AVaRICE is a program which interfaces the GNU Debugger GDB with the AVR JTAG ICE available from Atmel. Use AVaRICE standalone as a programmer, or it can be run as an intermediary between avr-gdb and the AVR JTAG hardware, allowing one to use GDB to debug your AVR code as it runs in-system.