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macOS features one of the best network firewalls: PF (Packet Filter). It comes in an "under the hood" fashion, installed and disabled by default.
Murus' purpose is to unleash its potential. With its easy and intuitive icons-based and drag&drop-based interface, visual layers of abstraction and a friendly view of the PF firewall it's a lean and mean tool to protect your Mac and network.
Designed with ease of use in mind, yet full of advanced options and monitoring tools, Murus is perfect for everybody; from the average user to the experienced UNIX guru/system administrator and even for educational purposes.
Configure and start the PF firewall in one click using built-in presets, use Murus graphical ruleset editor design tool or write fully customized rulesets using the advanced rule editor.
Murus Pro includes Vallum, an application-layer firewall. This allows you to take full control of your Mac at both application and network level.

A while ago macOS came with two default firewalls installed, IPFW and IPFW 2. In spite of the fact that IPFW worked brilliantly, with the release of macOS 10.7, all versions of macOS switched to the OpenBSD PF (short for Packet Filter) firewalling solution, that brings some improvements over the now outdated IPFW.