Comodo Internet Security
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Full user review
"Firewall is good for a freebe, but not worth the suite"
The Firewall is possibly the best firewall you can get for free.
The Sandbox mode can also be nice if you use it.
Everything else is pretty paranoid, to the point where even legitimate software requires you to shut down the whole suite to install. It also is quite sluggish, and required CCleaner to fully uninstall and remove from the registry. The tools, other than the firewall, didn't even function for the simplest of malware, while my other scanners (malwarebytes and Spybot S&D, both free) would find the malware directly after Comodo's Antivirus claimed I was malware free when stress testing.
If you really need a firewall for free, this is the one to get. If you want a suite that does it all, look elsewhere, and expect to pay if you want real security. Free might sound nice, but as the saying goes, you get what you pay for.
As far a free suites go, only the firewall really excels here. If you plan on mixing and matching pieces of different companies free security software, Comodo has one of the best free firewalls out today, keyword being free. If you want just one free suite to rule them all, look elsewhere, and save yourself a headache.
Also, the secure DNS is available to anyone without installing anything, if you set it up yourself. IF that is the deciding factor for you, look elsewhere.