debugWIRE toolkit for AVR microcontrollers.
BSD-3-CLAUSE License
AVRDUDE is a utility to program AVR microcontrollers
A command line tool for compiling Arduino sketches
The AVR toolchain used by the Arduino IDE
Arduino IDE 1.x
scripts to compile (and cross-compile from a Linux machine) dfu-utils package for Linux (x86_64, ...
Multitool!
A CMake toolchain for Arduino entirely based upon Arduino CLI
Homebrew AVR Toolchain
Official firmware for the OpenAstroTracker.