View source for CadSoft Eagle

[http://www.cadsoftusa.com/ CadSoft] makes EAGLE, a popular piece of software for designing electrical circuits and laying out PCBs.  It runs on Windows, Mac OS X, and Linux. There's a [http://www.cadsoftusa.com/freeware.htm free (as in beer) version] available for non-profit use.

===Learning===

====Sparkfun Tutorial Series====
* [http://sparkfun.com/commerce/tutorial_info.php?tutorials_id=108 Getting started with eagle]
* [http://sparkfun.com/commerce/tutorial_info.php?tutorials_id=109 The basics of laying out a PCB with eagle]
* [http://sparkfun.com/commerce/tutorial_info.php?tutorials_id=110 How to create a custom footprint & part in eagle] 

====Instructables====
* [http://www.instructables.com/id/Draw-Electronic-Schematics-with-CadSoft-EAGLE/ Draw Electronic Schematics with CadSoft EAGLE]
* [http://www.instructables.com/id/Turn-your-EAGLE-schematic-into-a-PCB/ Turn your EAGLE schematic into a PCB]
* [http://www.instructables.com/id/Make-hobbyist-PCBs-with-professional-CAD-tools-by-/ Make hobbyist PCBs with professional CAD tools by modifying "Design Rules"]
* [http://www.instructables.com/id/How-to-make-a-custom-library-part-in-Eagle-CAD-too/ How to make a custom library part in Eagle CAD tool]

===Parts Libraries===
* [http://www.opencircuits.com/SFE_Footprint_Library_Eagle Sparkfun Eagle Library]
* [http://www.cadsoftusa.com/cgi-bin/download.pl?page=/home/cadsoft/html_public/download.htm.en&dir=eagle/userfiles/libraries CadSoft's user-contributed libraries]