PF has been ported from OpenBSD to the other BSDs, and while the stated goal for these efforts naturally is to be as up to date as possible in relation to the newest PF versions coming out of OpenBSD, it is useful to keep track of the PF projects in the other BSDs.
The FreeBSD packet filter (pf ) home page (http://pf4freebsd.love2party.net/) describes the early work with PF on FreeBSD and the project goals. At the moment, the page is not quite up to date with the latest developments, but it will hopefully spring to life again once Max Laier notices that he is referenced in a printed book.
The NetBSD project maintains its PF pages at http://www.netbsd.org/docs/network/pf.html with updated information about PF on NetBSD.
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