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PF

Software
PF is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to netfilter, ipfw, and ipfilter. PF was developed for OpenBSD, but has been ported to many other operating systems. Wikipedia
Developer(s): The OpenBSD Project
Initial release: 1 December 2001; 22 years ago
License: BSD license
Original author(s): Daniel Hartmeier