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Windows Free Firewall Software for download
There aren't many free firewall programs left for Windows. Most of the software that was freeware has gone to a license or subscription plan - others are crippled. In the 2001, both NetGuard and Esafe Desktop from Aladdin stopped their free licensing for small user groups. I try to update this list regularly but things often change quicker than I can keep up with.
NetDefender is a free firewall program that comes with source code. This is about as basic of a firewall as you can get. This package will mostly appeal programmers that want to know how firewalls work. I would not consider this a full blown defense package for your computer.
Windows Built In Firewall
Windows XP has a firewall that comes with the operation system that can be enabled. It is not a robust firewall and offers no outbound protection at all. That means spyware and keyloggers are free to send results to hackers. It does however provide some level of inbound security. Watch for this to improve in Vista, Microsoft's new Windows version later this year>
Kerio Personal Firewall (KPF) is a software agent that builds a barrier between your personal computer and the Internet. KPF is designed to protect your PC against attacks from both the Internet, and other computers in the local network. Crippled into limited functionality after 30 days.
Outpost Firewall from Agnitum (new)
Agnitum Outpost is the first personal firewall for Windows developed with Open Architecture. The Open Development Process proved its efficiency with the development of the Internet and with Linux. No company can be as fast, flexible and innovative at enhancing a closed product as thousands of developers from different countries all working on an open one. FREE and PRO versions available
ZoneAlarm Free Version
This version is very crippled compaired to the version that you can purchase. You can try the free version here
NetVeda Safety.net
Another crippled version of their pro version. Give it a try but expect an upsell to their other version.
Other Free Firewalls for Windows
Another advanced application, filter by interface, on source and destination IP address, etc. Not for beginners.
TDIFW
This is a very simplistic firewall based on TDI. It is open source and has not been updated or active for years. I Expect by now it should be considered primitive.
http://sourceforge.net/projects/tdifw
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