Printed Circuit Board and Strip board Software.

 http://www.freepcb.com/
http://tinycad.sourceforge.net/
http://veecad.com/free.html
http://veecad.com/
http://www.dirfile.com/diptrace_free.htm
http://www.expresspcb.com/ExpressPCBHtm/Download.htm
http://www.pad2pad.com/download/index.htm
http://www.pcb123.com/
http://www.cadsoft.de/freeware.htm
http://www.electronics-lab.com/downloads/index.html
http://www.lis.inpg.fr/realise_au_lis/kicad
http://www.mercoelectronics.com/
http://tinycad.sourceforge.net/
http://www.evilmadscientist.com/article.php/pcbtools
http://www.winqcad.com/download.html
http://www.pcb-pool.com/html_uk/uk_service_1.htm
http://www.altium.com/Community/Support/Downloads/
http://www.altium.com/Products/AltiumDesigner/Licensingoptions/AltiumDesignerProtellicense2004/Downloads/AltiumFreewareEndUserLicenseAgreement/Autotrax/
http://www.altium.com/Products/AltiumDesigner/Licensingoptions/AltiumDesignerProtellicense2004/Downloads/AltiumFreewareEndUserLicenseAgreement/EasyTrax/
http://www.airborn.com.au/layout/easytrax.html
http://www.elektroda.net/download/pafiledb.php?action=download&id=472
http://ieee.usask.ca/TraxMakerInfoSheet.pdf
http://www.gtechno.com/bugs-n-fixes/tmbnf.htm
http://tech.groups.yahoo.com/group/muug/
http://www.circuitmaker.com/pdfs/tm_libraries.pdf
http://www.circuitmaker.com/support/product_doc.htm
http://my.ece.ucsb.edu/bobsclass/2C/Simulation/circuit_maker.htm
http://babbage.cs.qc.edu/courses/cs343/Circuit_Maker/
http://www.engineering.uiowa.edu/~ztowfic/circuitmaker.html
http://www.new-wave-concepts.com/
http://www.hutson.co.nz/rimupcb.htm
http://www.vutrax.co.uk/
http://www.eesoft.com/pctrace/Downloads/downloads.html
http://sss-mag.com/swindex1b.html