The gEDA project has produced and continues working on a full GPL'd suite 
and toolkit of Electronic Design Automation tools.  These tools are used for 
electrical circuit design, schematic capture, simulation, prototyping, and 
production.  Currently, the gEDA project offers a mature suite of free 
software applications for electronics design, including schematic capture, 
attribute management, bill of materials (BOM) generation, netlisting into 
over 20 netlist formats, analog and digital simulation, and printed circuit 
board (PCB) layout.