Open-source keyboard firmware for Atmel AVR and Arm USB families

UPDI programmer software for Arduino (targets Tiny AVR-0/1/2, Mega AVR-0 and AVR-DA/DB MCUs)

No RTOS need any more, you will see... Function pointers queues classes library for Arduino or any other platform. It is pure C++, use it anywhere. Manipulate with your tasks without delays, keep your interrupts extremely fast!

EX-CommandStation firmware from DCC-EX. Includes support for WiFi and a standalone WiThrottle server. A complete re-write of the original DCC++.

Atmel AVR: development platform for PlatformIO

A debug interface for AVR-based embedded systems development on GNU/Linux.

TinyCore boards / attiny 1 series Core, Arduino IDE Core, targets ATtiny 417 / 814 / 816 / 817 / 1614 / 1616 / 1617 / 3217 and similar MCUs

An Arduino Mega Operating System With TFT TouchScreen Support, pretty GUI and other mumbo-jumbo I may come up with

Header-only library for bare metal hardware programming in C with a pleasant generic style.

This is a simple CW beacon project based on Arduino and Si5351 clock generator. It transmits a predefined message as morse code on a fixed frequency.

Embedded Systems in D - Port of avr-libc headers and most avr-gcc processor defines

ATtiny High-voltage Serial Programmer with Chip Erase function

QMK based 5x12 ortholinear keyboard

DIY customizable Tamagotchi aimed towards the furry (Kemono) community.

AVR Microcontroller Programming with Assembly

Minimal, production-ready timeout library for Arduino. With pause / resume.

Fastest library to control TM1638 chip (for example: "LED AND KEY") based modules

USB Serial firmware for Adafruit's Atmega32U4 breakout board (discontinued) created using Atmel Studio 7 and LUFA.

Complete Arduino project to build a Remote Controlled Car together with the bluetooth linked Remote Controller

C headers for AVR microcontrollers. Arduino must die!