There's some free software from several companies. You can go to www.4pcb.com
and download theirs (I've never used it). PCB Artist.
Express PCB has their own (again, not used).
I think there is a free version of Eagle schematic capture (not used that either).
I use Orcad Schematic Capture, but that costs $$.
If you are doing simple simple brewing stuff, Visio would work fine.