Pcb
has been tested on NetBSD and works without any problems.
You may also be able to find a NetBSD package at
ftp://ftp.netbsd.org/pub/NetBSD/packages/cad/pcb/README.html or a
FreeBSD port at
http://www.freebsd.org/cgi/url.cgi?ports/cad/pcb/pkg-descr.