As it name would suggest, gamegiveawayoftheday.com is in the business of offering free downloads of popular (and not popular) computer games, free of any restrictions: these are not "demos."
The site doesn't appear to be updated daily but, if you're a PC gamer, it's definitely worth bookmarking. Recent giveaways have included HUMVEE Attack, King Mania, Ozzy Bubbles, and Jets n' Guns. I've never heard of any of those, but I'm not much of a gamer.
If you're interested in free stuff -- as opposed to merely inexpensive stuff, the main focus of the Daily Deal -- you should definitely bookmark our Fantastic Freebies page, and check back daily.