====== gerber ======
  *[[http://claymore.engineer.gvsu.edu/~steriana/Python/gerbmerge/|GerbMerge]] 
  *[[http://www.hsdgt.com/|한샘디지텍]]

====== eagle ======
  *[[http://www.cadsoftusa.com/|CadSoft]] Eagle cad official page
  *[[https://launchpad.net/ubuntu/karmic/+source/eagle/5.4.0-4ubuntu1|eagle karmic]]
====== tutorial ======
  *[[http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=109|eagle to gerber]]