AvrTools download

AvrTools, developed by Atmel (now part of Microchip Technology), is a collection of utilities that support the development, programming
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Alternative software

eXtreme Burner - AVR
eXtreme Burner
Free
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It is a GUI supports several types of clock sources for various applications.

AVR Simulator IDE
AVR Simulator IDE
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It supports microcontrollers from the Atmel megaAVR and tinyAVR architectures.

Robokits AVR USB Programmer
Robokits AVR USB Programmer
Free
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It can program AVR devices in STK500V2(HID Mode) and STK500(CDC Mode) modes.

AVR LCD Visualizer
AVR LCD Visualizer
Free
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AVR LCD Visualizer helps create and modify your own LCD displays.

KamPROG for AVR
KamPROG for AVR
Free
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Development/production programmer supporting most ISPs.