OpenPAM
OpenPAM is a BSD-licensed implementation of PAM used by FreeBSD , NetBSD , DragonFly BSD and macOS ( starting with Snow Leopard ) , 
<triplet> OpenPAM <subj> PAM <obj> implementation of <triplet> macOS <subj> FreeBSD <obj> part of the series <triplet> Snow Leopard <subj> macOS <obj> instance of