ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
Gufw - Gufw is an easy, intuitive way to manage your Linux firewall.
TinyWall - Lightweight and non-intrusive firewall
PC Tools Firewall Plus - PC Tools Firewall Plus Free Edition is a powerful personal free firewall for Microsoft Windows that protects your computer from hackers and intruders. Firewalls
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
LuLu by Objective-See - LuLu is the free open-source macOS firewall that aims to block unauthorized (outgoing) network...