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The most reliable website for downloading free software is
Download.com. The site has been around since the early days of the web and is currently operated by cnet.com. What I like so much about this site is that they not only have editor's ratings, but they allow user ratings and comments. Why rely on just one person's opinion when you can see what dozens or even hundreds of people have to say about a particular product?
Download.com divides their offerings into categories so you can go straight to their Security Software section and then sort the free computer security systems software by popularity, downloads, ratings, and more. It's the quickest and easiest way to find not only the highest rated free software, but what more people are using than anything else.
Because Download.com screens the software they put onto their site, it helps to guarantee that you won't get tricked into downloading a fake virus scanner or some other kind of malware. Some of their software is ad-supported, but there will be warnings on packages that contain piggy-backed adware.
(Image source: Download.com Screenshot)