I think if you have an Xbox One or so, you can grab a few games fer freebies.
some examples I may know of:
Saint's Row
Saint's Row 2 (Dunno if these are freebies anymore but they're at least pretty good)
Crackdown
Crackdown 2 (Same with the above, dunno if they're freebies anymore, but eh.)
Phantom Dust (though, it's also playable on PC)
Too Human (There's a funny reason why this one's a freebie, it's because of bunch of legal hubbub, it's illegal to actually sell this game on Microsoft's storefront so... ...they instead made it a free game, though, it is the game that ended Silicon Knights, the same group that brought us the gamecube port of Metal Gear Solid)