Where to Download Free Firewalls for Windows and Mac OS

What is a Firewall?
A firewall is a barrier on a computer network or on the computer itself that prevents unauthorized access to a computer - while allowing only authorized access - by other computers on the network. An example of such a network is the internet and firewalls are important to prevent the activities of hackers and malicious software or websites who may want to infiltrate your computer. Firewalls may be hardware or software. Hardware firewalls are appliances that are connected to a network and do the jobs of the firewall while software firewalls are programs that can be installed on the computer itself.
This article is concerned with software firewalls and where you can download them for free. The following are some of the best firewalls available as free download for PCs and Linux computers.
Where to Download Free Firewalls for Windows PCs (XP, Vista and Windows 7)
ZoneAlarm: Works to prevent infiltration of your network by making your pc invisible on the internet. Prevent hackers and malicious software such as viruses and spyware from gaining access to your computer. Download Here
Comodo Personal Firewall: Comodo is a highly rated program that combines a firewall and antivirus. It scans all inbound and outbound network traffic. During installation, you may choose only the antivirus, only the firewall or both. Download Here
PC Tools Firewall Plus: Prevents hackers and intruders but it is recommended that you use it alongside antivirus software. Monitors both incoming and outgoing traffic and does not cause interruptions when using full-screen applications. Download Here
Ashampoo Firewall Free: Scans all computer network activity and can be used in both novice and expert configurations. It is easy-to-use and has a "Block All" feature for emergencies such as when you think you are under attack. Download Here
R-Firewall: Lightweight and easy to use, R-firewall monitors both inbound and outbound traffic, scans email attachments for dangerous content, blocks pop-ups and does a lot more. It is automatically configured right after installation. Download Here
Online Armor Free: Prevents malicious software and hackers from infiltrating your computer and protects your identity on the internet. It is recommended that you use it alongside antivirus software.Download Here
Sunbelt Personal Firewall: This program filters both incoming and outgoing network traffic. It is recommended that you use it alongside antivirus software. Easy to use and does not slow down your pc. Download Here
SoftPerfect Personal Firewall: This program is not designed for use by beginners. It includes features such as password protection and multiple network configurations. Download Here
Agnitum Outpost Firewall Free: Monitors incoming and outgoing traffic and is easy to use. It supports only Windows 2000, XP, and Vista. Download Here

Where to Download Free Firewalls for Linux Computers
SmoothWall Express: Open source and easy to use, with support for cheaper and older hardware. It can work with a wide array of hardware and different connection types. Download Here
FireStarter: Free and open source program that gives the option of whitelisting or blacklisting traffic as you choose. Easy to use and allows internet connection sharing. Download Here
IPCop: Easy use, open source and free to download. Allows multiple configurations and provides stable protection. Download Here
Shoreline Firewall: Also known as Shorewall, this software can be used to blacklist traffic and it supports a wide range of network protection applications. Download Here

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