Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.

Comodo Firewall - Comodo Firewall Pro - Secure your system against internal attacks such as Trojan viruses /...

Radio Silence - Radio Silence is a network monitor and firewall for the macOS. The software stops apps from making network connections. The firewall runs in the background and does not require an open window.

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...

TinyWall - Lightweight and non-intrusive firewall