EAGLE (Easily Applicable Graphical Layout Editor)
is a powerful tool for creating printed circuit boards (PCBs).
It requires a 586 (or higher), kernel 2.x (or higher), and
X11 in at least 8bpp mode with 1024x768 min. resolution.
The freeware edition limits the useable board area to
100x80 mm, two signal layers, and one sheet in the