GitHub - AaronC81/AOS: An 8-bit AVR operating system
Amazon.com: USB Programmer, High Performance TL866II Plus Programmer Flash Programmer for EEPROM Flash 8051 AVR MCU GAL PIC with 10 Adapter Automatically Identify The Operating System : Electronics
AVRSH: a Command Interpreter Shell for Arduino/AVR. : 6 Steps (with Pictures) - Instructables
AVRILOS: A simple OS for AVR microcontrollers - CodeProject
SOSSE - Simple Operating System for Smartcard Education
GitHub - zrafa/xinu-avr: the Xinu OS for AVR atmega328p devices (e.g. Arduino)