Murus macOS Firewall Unchained with rich-feature set and native user macOS user-interface. It's super user-friendly especially for non-technical users.
Murus unleashes the great power of the macOS built-in PF firewall. Protect your network resources using a very simple interface, take advantage of the many pro features available to design and implement your network infrastructure, to monitor performances and proactively filter dangerous traffic at network layer. Murus is available in three different versions in order to meet everyone’s needs. And there’s even more: port knocking, adaptive firewall, NAT and many other features including a blazing-fast logging system.
Murus Lite is a free edition (not an open-source), and the other editions are not free nor open-source