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. 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!