[sdiy] Free Electronics CAD/Simulation program?

[Josh Henne]

Hello All;

I have a bunch of module schematics I'd like to build,  but I am unsure if 
the schematics are drawn correctly since there are no dots or "curves" to 
indicate which "wires" are joined or overlap. So before I blow a few 
components on a breadboard I'd like to see if I can simulate or verify the 
circuit in some sort of CAD program to check for errors. Is there anything 
that's free that can do this? I realise it might be hard to simulate certain 
IC's especially if it's something older.

BTW what's a good tool for cutting/punching out perfect rectangular or 
square holes in panels.. say If I want rectangular LEDs instead of round?... 
what I wouldn't do for a CNC cadcam machine......

Josh