LuLu by Objective-See Alternatives

Visualize network activity in detail, get notified when new apps access the network, look out for...

Lightweight and non-intrusive firewall

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

Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.

Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.

Windows Firewall Control is not the built in firewall system in the Windows operating systems.

Emsisoft Online Armor Firewall is a freemium online firewall protection system by the Emsisoft that is based on the own independent protection technology of the Emsisoft.

Gufw is an easy, intuitive way to manage your Linux firewall.

Plasma Firewall is an open-source control panel with which you can manage your system firewall.

Open Source

NuFW is a GPL extension to Netfilter (that is Linux firewall). It adds identity-based filtering, i.

ufw KDE is a full-fledged and intuitive Graphical User Interface built to help you manage Uncomplicated Firewall.

Server-based firewall.

Firestarter is an Open Source visual firewall program.