I'm sure there are, but none are coming to mind. I'm sure there are at least some altruistic developers out there that just want to share their ideas, but for the most part, these are simply demos/school projects that are intended to show the developer's skill set so they can get decent jobs coding for major game companies.
I would not expect (or even hope for) someone to put thousands of hours into game development and expect absolutely nothing in return for it. Probably your best bet (and what I do each weekend) is head over to Steam's web site and check for any new/free to play games that just came out.
-Wolf sends