It is asking a lot and the answer I give isn't that good...
I've been playing with (no it's not a profit site - I'm just checking it out for someone in another forum because I happened to see it while it was in beta and free) this:
(code tag used to not be a link which is odd, we get too much traffic at that site actually)
Code:
http://games.kgiii.info
That is free and you DO have to grab your own games. That's the downside. So it's not really an answer to your question in a very accurate manner - sorry about that. My initial views are that it's really simple and effective. Grab the game, upload it, make a screen shot, and upload it.
The script says, VERY exact, that I can distribute it. I think I might have seen it here first.
Finding free games doesn't APPEAR to be too hard... "Piracy" appears to be rampant with that category and for Flash or JavaScript games they don't SEEM to mind too much from what I'm seeing? A quick email to the author would be advised though and in almost all cases I'd be willing to bet (remember they're probably getting ad revenue if it was coded with that in mind) that many will not mind the additional free exposure. So don't go the piracy route but rather get permission, stay safe, keep EVERY email that said you can use the content, and then when you go to sell it you can also add something akin to, "I also have the complete records for permission to use each and every game."
Like I said, it's not really the answer you wanted perhaps? It is, I hope, an alternative solution and probably not a very difficult one. With game scripts, more than any other script besides maybe a few forum scripts and add-ons, watch VERY carefully for piracy...
KGIII