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AVR/Arduino Hardware Debugger on the Cheap (part 3) - Wayne's Tinkering Page
Atmel-ICE
AVR ISP 10P to ICSP 6P Converter - ElectroDragon
Atmel AVRISP cables save cost/space on every board | Tag-Connect
How to Debug your AVR Project with the Atmel-ICE
Pololu USB AVR Programmer v2.1
AVR-ISP-MK2 - Open Source Hardware Board
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USB AVR JTAGICE XPII, AVR Programmers & Debuggers
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AVR-ISP-MK2 Olimex Ltd. | Mouser
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Power Debugger
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