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The first of a few Piriform programs on this list, CCleaner—the first C is for Crap!—is one of the best, and pretty much essential for keeping a system going. What it does is simple: it cleans up extraneous files to keep a system running better. Get it and run it, regularly. It'll even delete some apps you didn't think you could get rid of—like those provided in Windows 10, whether you wanted them or not.
Freeflys: Another strong contender in the freebies space, Freeflys has appeared on NBC’s Today Show, The Doctors, Fox News and a handful of other media outlets. Similar to most of these sites, Freeflys utilizes email alerts to tell users about free-sample offers as they happen. The site also allows you to search for a specific product with the handy search bar.