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)

Unleash your interrupts with an ultra-fast task manager, delivering tens of thousands of push/pull TPS even on simple MCUs. Interrupts stay blazing fast by enqueueing parameterized tasks instead of executing logic immediately. Whenever the program must wait, useful tasks run instead—eliminating blocking and dummy wait loops. The simplicity matter!

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

On-chip debugging for AVR and RISC-V microcontrollers, 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

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.

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

AVR Microcontroller Programming with Assembly

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

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.

NanoUPDI: The smallest USB Type-C serial UPDI programmer for your projects

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

This is a simple circuit that augments the second gen Suzuki SV650 to have a gear position indicator.

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.