Recreating Arduino IDE build functionality inside the command line

Makefile for Arduino sketches. It defines the workflows for compiling code, flashing it to Arduino and even communicating through Serial.

AVRDUDE is a utility to program AVR microcontrollers

Arduino command line tool

CLUNET library - simple single-wire peer-to-peer network driver for AVR microcontrollers, perfect way to interconnect microcontrollers in your house

The AVR-LibC package provides a subset of the standard C library for AVR 8-bit RISC microcontrollers.

This is simple, not full implementation of LoRaWAN 1.0.3 protocol for AVR

MicroZig is a toolbox for building embedded applications in Zig.