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We generally rely on Anti virus programs to safe guard our digital world. Most of the free Anti virus software does not provides complete protection as they lack features like firewall, anti-spy protection etc.  A good firewall  enhance your security against internet threats. If  you do not want to spend money on paid antivirus security tools, then you can go with installing these free firewalls with your free antivirus program.

1. Ashampoo Firewall Free
Ashampoo firewall free is a easy to use firewall which doesn’t requires you to have technical  knowledge . It uses very little memory and computer resources and provides heavy duty protection.

2.  Zone Alarm Free Firewall
Zone Alarm is one of the most widely used firewall . It also gives you spyware protection and warns you when you are about to download any malicious program monitoring both inbound and outbound traffic.

3.  Comodo Firewall
Comodo Firewall works on default deny action . It checks an extensive list of over two million known PC-friendly applications and allows only safe files to execute and enter your system.

4. Online Armor Free Firewall
Online Armor again is a free firewall which provides protection against  malicious programs . It also provides identity protection . This allows you to lock down your online browsing sessions and protect yourself from malicious websites installing nasties on your machine.

5.  PC Tools Free Firewall
PC Tools firewall has extended self protection to block malicious programs bypassing the firewall. Its an easy to use application to prevent unauthorized users from gaining access to your computer through internet.

6. Sygate Personal Firewall
Sygate Personal Firewall is the first free PC firewall to offer protection from malicious code intrusions protecting your PC from hackers, Trojan horses, and DOS attacks. New features include deep-packet inspection, anti-application-hijacking, a log dampener, and enhanced logging.

7.  Filseclab Personal Firewall
Filseclab is a free  firewall which also provides it source code ,  it also provides adware and spyware protection.

8. Agnitum Outpost Firewall Free
Agnitum Outpost Firewall provides proactive protection against malware with control over installed applications’ activity, illegal termination prevention capabilities, policy correction for popular applications, and real-time network statistics.