Online Armor Free
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Full user review
"Only firewall that works aside from comodo"
Good firewall with some unique protection. For free it has script blocking(only other program I'm aware of is avast,but only in paid versions)which is rather nice. I really like the keylogger detection.
Has poor integration with Windows Security Center. Windows detects firewall is off on startup(wouldn't be much of a problem if this wasn't a laptop)and have to shut down and restart online armor. Other then that it works great.