ZoneAlarm Free Firewall
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Full user review
"Solid Firewall but still free"
The intelligent mode learns and adapts in smart way.
Pro version comes at a expensive price, no free virus protection.
I have tested many 3rd party firewall applications but I have always come back to ZA Free firewall. The intelligent mode learns and adapts in smart way. Offcourse if you need greater protection always go for the pro version. But free version is a no compromise when it comes to protecting your PC.