OpenWRT is a little bit different than most on this list, as it's a firewall developed specifically for use in routers and networks. This means that it's not intended for ordinary home users looking to simply install a new firewall on their machine, as much as power users, networking enthusiasts, and wireless device developers.
ClearOS is a CentOS-based distro that’s designed as a full featured replacement to commercial server distros like Red Hat Enterprise Server or Windows Small Business Server. You can use the community edition of ClearOS to roll out all kinds of network services including a firewall, with content filtering and intrusion detection capabilities.
OPNsense implements a stateful firewall and enables users to group firewall rules by category, which according to its website, is a handy feature for more demanding network setups. The firewall uses an Inline Intrusion Prevention System.
pfSense is an open source firewall software for Large Enterprises. The tool extends your applications and connectivity to authorized users everywhere.
IPFire is an open source firewall and Intrusion Detection System (IDS). The tool prevents cybercriminals from breaking into your organization's network.
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