GNUduino is an Arduino board (Arduino Single-Sided Serial Board Version 3) redrawn using gEDA. GNUduino functions same as that of an Arduino board (It's just a clone of Arduino). The schematic and PCB layout for GNUduino is completely designed using a free software tool gEDA
Download Schematic and PCB layout - http://github.com/jeffreyantony/GNUduino
Blog Posts
http://jeffrey.co.in/blog/2010/10/gnuduino-arduino-made-with-geda/