PC Tools Firewall Plus Free Edition
Full user review
"Not Useful; Can Be Dangerous to Inexperienced User"
It's ineffective - port open tests show loads of vulnerabilities - like most of PC Tools' products, this one is also baitware. And the install can be dangerous to the noob who will probably download PC Tools' system killer Threatfire as part of the deal. Personally, I'd stay away from all PC Tools products.