Uses Ruby and Rake.

A Rake + avr-gcc + avrdude scaffold to compile for Arduino without the IDE.

Repair a broken control panel, or add features.

How to use an atmega168 as a standalone Arduino with just two extra components.

Using sleep and the watchdog timer, it's possible to run an Arduino for three years on regular batteries.

An open-source, cross-platform software tool that ‘allows users to document their Arduino and other electronic-based prototypes, and to create a PCB layout for manufacturing.’

Cheap Arduino stuff.

Breadboard-compatible Arduino Clone.