Atmega fuse doctor is hardware that repair dead atmega chips,when you mess up the fuses insade the chip.
This piece of hardware can fix about 140 difrent avr chips.
My fuse doctor is protected with heat shrink tubing :) It looks awesome:)
Some picture of my fuse doctor and schematic.
The original website I found here: http://diy.elektroda.eu/atmega-fusebit-doctor-hvpp/