Helpful Links

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Printed Circuits Industry Standards http://www.ipc.org/
Free Gerber viewer and Cad/Cam program http://www.graphicode.com
Free Gerber viewer and Cad/Cam program http://www.pentalogix.com/viewmate.php
Calculators for trace widths&thickness, Impedance and much more http://www.ifigure.com
Equipment and Calculations Program for Controlled Impedance http://www.polarinstrument.com
“Autocad viewer” for files format: DXF, DWG, DNF, CSF http://www.edrawingsviewer.com
Impedance calculator http://emclab.mst.edu/pcbtlc2/index.html
Impedance calculator http://www.chemandy.com
Impedance calculator http://www.mantaro.com
More calculators http://www.ultracad.com
More calculators http://wcalc.sourceforge.net
Gerber Viewer http://www.mccad.com/FREE_GerberViewer.html
Gerber Viewer http://gerbv.gpleda.org/
Gerber Viewer http://www.gerber-viewer.com/
Gerber Viewer http://www.viewplot.com/
Gerber Viewer http://circuitpeople.com/
Gerber Viewer http://www.easylogix.de/products_detail.php?prog_id=1
Industry News http://evertiq.com/
More about Dielectric constant (Dk) http://www.taconic-add.com/pdf
More about Dissipation Factor (Df) http://en.wikipedia.org/wiki/Dissipation_factor
More about Coefficient of Thermal Expansion (CTE) http://www.pcbdesign007.com/pages/zone.cgi?a=71427
What is a GERBER File? http://circuitpeople.com/Blog/WhatIsAGerberFile.aspx
ll about CIRCUITS http://www.allaboutcircuits.com/tools/