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AVRpal.net was designed as an Open Source Windows based GUI for the popular avrdude Command Line utility for AVR microcontroller Programming.

It has got many features with a lightweight easy to understand interface. LibUSBdotnet and avrdude is provided with it.

Features:

Easy to use Interface
On Screen avrdude command execution monitoring.
USB handling capability
Auto detection of mcu
Works only with USBasp
With latest firmware,it is possible to set slow sck option from the software by setting the bitclock timing
EEPROM Editor
Advanced fuse editor
Lock bytes can be read or written now
Zadig genetic USB driver installer is now included and can be installed from the main screen
Button for opening avrdude in command prompt for advanced users
NOW COMES with Arduino Hex Loader...an useful tool for those who wish to use arduino with other compilers/IDEs such as AVR/Atmel Studio
Basic Serial/USART/UART Terminal