PCB is an interactive printed circuit board editor for the X11 window system with either a GTK interface (default) or a lesstif interface.
PCB includes a rats nest feature and Design Rule Checking.
PCB offers high end features such as an autorouter and a trace optimizer which can tremendously reduce layout time.
PCB includes exporters for:

• Gerber: Industry standard RS-274-X and NC drill output.
• BOM: Bill of material and centroid data X-Y data output for use in the board fabrication and assembly process.
• PS: PS output.
• PNG: GIF, JPG and PNG graphic formats output.
• Nelma: Output files for trace capacitance calculations.