pcb  4.2.2
About: PCB is an interactive printed circuit board editor for the X11 window system. PCB can produce industry standard RS-274X and Excellon NC-Drill format output for submission to board manufacturers.
  Fossies Dox: pcb-4.2.2.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

pcb - Printed Circuit Board editor.

PCB Introduction

Development Branches howto

PCB Releases howto

PCB for Windows with a MinGW cross-compiler howto

Building a PCB Windows installer under Cygwin howto

PCB Launchpad PPA howto