What is PCB ?
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, Blind and Buried vias, and Design Rule
Checking.
PCB offers high end features such as an autorouter, a topological router
and a trace optimizer which can tremendously reduce layout time.
Plug-ins: compile separately and load at startup of pcb.
PCB includes exporters for:
  - Batch: text line "batch" HID, which exists for scripting
         and non-GUI needs.
  
- 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:
         Export output files for trace capacitance calculations.
  
- GSvit: Export output files
         for Finite Difference in Time Domain calculations (FDTD).
  
- IPC-D-356: Netlister with output conforming to the
         IPC-D-356 standard rev. 0.