SOFTWARE ELECTRONIC TOOL

http://www.cadsoft.de/ Eagle Cad Software for Windows and Linux (free version available)
http://opencircuitdesign.com/xcircuit/ XCircuit, an open-source (free) circuit drawing program
http://bach.ece.jhu.edu/~haceaton/pcb/ PCB, a free Unix/Linux Printed Circuit CAD program
http://lwn.net/2000/features/xcircuit/ LWN Review of Xcircuit
http://lwn.net/2000/features/pcb/ LWN Review of PCB
http://www.geda.seul.org/ gEDA GPL Electronic Design Automation
http://www.solorb.com/linux8bit/ Linux Cross Assemblers
http://www.freepcb.com/ a PCB layout editor for Windows
http://www.freerouting.net/
http://www.diptrace.com/ Schematic & PCB Design Software