Comodo Firewall Pro
Windows This protective dragon for XP and Vista keeps hackers out of your system, controls which programs can access the Net (its whitelist of about one million means you get fewer pop-ups), and blocks tricky "leak test" techniques. It's both tough and good-looking.
Read our full review of Comodo Firewall Pro.
Windows | WebBe sure your fire-walls are keeping your always-on Internet connection hidden from attackers. Shields-UP! provides a quick confirmation.
Read our full review of ShieldsUP!.
LinuxGot a spare PC running a Pentium 200 MHz or higher with 128MB of RAM? Turn it into a dedicated network firewall with this open-source download.
Windows The free edition remains a useful protector against hack attacks and against programs that abuse your Internet connection.
Thanks to: PC Magazine.