Little Snitch

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

Commercial $ $ $ Mac

COMODO Internet Security

Comodo Internet Security is a free, very voluminous and multi-layered security application that keeps hackers out and personal information in. If you prefer a smaller...

Freemium $ $ $ Windows

Comodo Free Firewall

Secure your system against internal attacks such as Trojan viruses / malicious software and external attacks by hackers. Safeguard your personal data through a simple...

Free Windows

TinyWall

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

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...

Free Open Source Linux

Privatefirewall

This personal firewall and intrusion detection application provides comprehensive online security. It constantly monitors your PC for intrusion and reports any findings...

Free Windows

ZoneAlarm Free Firewall

ZoneAlarm Free Firewall blocks hackers from infiltrating your home PC by hiding your computer from unsolicited network traffic. By detecting and preventing intrusions...

Freemium Windows

Windows 10 Firewall Control

Protects your applications from undesirable network incoming and outgoing activity, controls applications internet access. Allows you to control personal information...

Freemium Windows

Windows Firewall Notifier

Windows Firewall Notifier (WFN) extends the default Windows embedded firewall behavior, allowing to visualize and handle incoming or outgoing connections.

Free Open Source Windows

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...

• Discontinued Active development stopped in 2005.

Free Open Source Linux

CacheGuard-OS

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

Commercial $ $ $ Windows VirtualBox VMware vSphere Hypervisor Microsoft Hyper-V Server Proxmox Virtual Environment

PC Tools Firewall Plus

PC Tools Firewall Plus is a powerful free personal firewall for Windows® that protects your computer by preventing unauthorized users from gaining access to your...

• Discontinued Last version, 6.0.0.74, was released on September 29, 2009. It can be still downloaded from Download.com.

Free Windows

Filseclab Personal Firewall

Filseclab Personal Firewall Professional Edition is one of the most important software of Filseclab, it is very easy to use and also very powerful. It can provide more...

• Discontinued The last update was released on July 29th, 2005.

Free Windows

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

Sygate Personal Firewall

Sygate Personal Firewall is a bit old but good firewall for Windows. It uses very small amount of system resources and is quite robust. The project is now...

• Discontinued On October 10, 2005 Symantec Corporation acquired Sygate Technologies, so Sygate Personal Firewall has been replaced by an advanced "Smart Firewall," available in Symantec’s Norton Internet Security. Sygate Personal Firewall can still be downloaded from Tucows.

Free Windows