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GerbMagic
GerbMagic is a free viewer for Gerber RS-274x and Protel ASCII PCB (Protel v2.5 to v2.8 formats). It can also convert Gerber RS-274x and Protel ASCII PCB to PostScript, PDF, TIFF, BMP and RID formats....
QualECAD View3D 99SE
QualECAD View3D is an accurate 3D viewer that integrates seamlessly into the Protel printed circuit board design environment...
printed circuit design viewer design circuit Design Environment 3D circuit animation