Alliteration aside, the most popular firewall program I see recommended on this site, outside of the one built into Windows, is Comodo Firewall. While there is certainly nothing at all wrong with it, if you are looking to explore alternatives then PC Tools Firewall Plus is worth a look.
PC Tools Firewall Plus is advanced technology designed especially for people, not just experts. Powerful prevention against attacks and known exploits is activated by default while experienced users can optionally create their own advanced packet filtering rules, including IPv6 support, to customize the network defenses. All you need to do is install it for immediate and automatic ongoing protection.
Basically, everything you would expect to find in a firewall package is there. I imagine the difference between Comodo and PC Tools Firewall Plus would be small if any, so it would boil down to personal preference.
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