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

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

OpenSnitch

OpenSnitch is a GNU/Linux port of the Little Snitch application firewall.

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...

• Discontinued Active development stopped in 2005.

Free Open Source Linux

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

Wallix Pro Firewall

Wallix Pro Firewall prevents intruders from accessing your computer and that’s the main objective for a computer firewall. It automatically detects and blocks attacks...

• Discontinued Website now longer exists to provide download. Program is still available on other sites.

Free Windows

Core Force

CORE FORCE is a free comprehensive endpoint security solution for Windows 2000 and Windows XP systems. CORE FORCE provides inbound and outbound stateful packet...

• Discontinued Last modification date: 10/25/05. See https://www.coresecurity.com/grid/index-open-source-tools

Free Open Source Windows

DefenseWall

DefenseWall is a sandboxing-style personal firewall solution that wins when your anti-virus fails. DefenseWall is based on a sandboxing approach that uses rights...

Commercial Windows

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

FortKnox Firewall

FortKnox Firewall is personal firewall solution that allows you to protect a PC against hacker attacks, trojans, spyware and internet threats. It has built-in Intrusion...

Commercial Windows

Armor2net personal firewall

Armor2net personal firewall software stops hackers, data thieves, and protects your PC from Internet-borne threats. Armor2net firewall can meet your requirements for...

• Discontinued The official site seems no longer available, but the software is still available through download sites.

Commercial Windows