ᕲ Duino-Coin is a coin that can be mined with almost everything, including Arduino boards.

Ferret is a free software lisp implementation for real time embedded control systems.

T12 Quick Heating Soldering Station

AVRDUDE is a utility to program AVR microcontrollers

Arduino (8-bit AVR) simulator, written in JavaScript and runs in the browser / Node.js

Software for USB-connected relays with HID interface. See the WIKI for more info.

Tiny Software Protocol for communication over UART, SPI, etc

Collection of cartridges, adapters, and replacements for the Commodore C64

Arduino TM16xx library for LED & KEY and LED Matrix modules based on TM1638, TM1637, TM1640 and similar chips. Simply use print() on 7-segment and use Adafruit GFX on matrix.

Minimal I2C master routines for all AVR microcontrollers.

Fast Graphics Library for Attiny85 and SSD1306 over I2c

Electronic Lead Screw for metal lathe

Collection of AVR Programmers and Accessories

Small version of the famous component tester from mikrocontroller.net

Arduino library to read VCC supply level without external components

FlashForth development

Bare ATmega 8/168/328 microcontrollers with the Arduino IDE.

C++ platform to build Arduino and AVR projects. Rationale is size and speed optimization.

Source code for the popular SwinSID SID replacement

DIY GPS GSM vehicle tracker based on SIM808 module and ATMEGA328P