Comodo Firewall

Comodo Firewall Pro - Secure your system against internal attacks such as Trojan viruses / malicious software and external attacks by hackers.

Free Windows

TinyWall

TinyWall is a free software to harden and control the advanced firewall built into Windows Vista, Windows 7 and Windows 8.

Free Windows

Gufw

Gufw is an easy, intuitive way to manage your Linux firewall. It supports common tasks such as allowing or blocking pre-configured, common p2p, or individual ports port(s), and many others! Gufw is powered by Uncomplicated Firewall (ufw).

Free Open Source Linux

Firestarter

Firestarter is an Open Source visual firewall program. The software aims to combine ease of use with powerful features, therefore serving both Linux desktop users and system administrators.

Free Open Source Linux

IceFloor

IceFloor is the first OS X free graphic frontend for PF. Configure the PF firewall in a few clicks using a very simple interface and a step by step in-app configuration guide (Quick Start).

Free Open Source Mac OS X

Murus Firewall

Murus is a frontend for the OS X PF network firewall. From basic filtering to advanced proactive options, Murus allows to easily configure a complex network setup dragging and dropping icons and moving sliders and selecting checkboxes.

Freemium Mac OS X

Nufw

NuFW is a GPL extension to Netfilter (that is Linux firewall). It adds identity-based filtering, i.e. it is possible to create firewall rules dependent on the user. ...

Free Open Source Linux netfilter

CacheGuard-OS

CacheGuard OS is an Appliance oriented Operating System dedicated to Web traffic Security and Optimization.

Free Open Source Windows VirtualBox VMware vSphere Hypervisor Microsoft Hyper-V Server Proxmox Virtual Environment