Sometimes programs are born great, and sometimes they have greatness thrust upon them. There's a third tack, too: some program grow into their skins. Comodo Firewall Pro is one of those.
Living under the radar for too long, at some point out of the limelight it became a solid, state-of-the-art firewall with little reason left to ignore it. Providing a smorgasbord of information and options for advanced users, simple enough for beginners, and yet runs smoothly and silently in the background, Comodo is a prime example of what a program that mucks about with your Internet connection should be like.