Actually the OpenBSD guys rewrote their pkg_* tools (in Perl) some time ago. See http://cvs.openbsd.org/papers/ven05-espie/index.html for more information. On FreeBSD you still have to use old pkg_* tools that are not so sophisticated. On the other hand in FreeBSD you have the portinstall/portupgrade stuff since FreeBSD software installation process is more focused on support for installation from source...

Their website does not seem to work with Firefox... But it works with Lynx!!!