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 is available in three flavors. All Murus versions can be used for commercial purposes excluding Murus family pack licenses and Murus Lite:
Murus Lite is the entry level firewall front end. Everybody can download it and use it for free for non-commercial use. It features inbound filtering and logging and can be used to protect services running on the Mac. Despite being free Murus Lite is not a tryout or demo. It is a full featured app and is a good starting point for the novice user.

Versions:
• Download is for current version
• Version 2.0.3 for macOS 10.12-10.13
• Version 1.4.22 for OS X 10.9-10.12

Requirements:
macOS 10.14.4+
Universal Binary