ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
LuLu by Objective-See - LuLu is the free open-source macOS firewall that aims to block unauthorized (outgoing) network...
ferm - ferm is a tool to maintain complex firewalls, without having the trouble to rewrite the complex...
Plasma Firewall - Plasma Firewall is an open-source control panel with which you can manage your system firewall.
Emsisoft Online Armor Firewall - Emsisoft Online Armor Firewall is a freemium online firewall protection system by the Emsisoft that is based on the own independent protection technology of the Emsisoft.
Nufw - NuFW is a GPL extension to Netfilter (that is Linux firewall). It adds identity-based filtering, i.