Let's cover some free stuff available at the moment as several companies are giving away stuff at the moment. Just check each platform's respective storefronts.
Too Human (360/X1)
Crackdown 1 (360/X1)
Crackdown 2 (360/X1)
Doritos Crash Course (360/X1)
Harms Way (360/X1)
Hexic HD (360/X1)
Pathway (Epic)
Jump Rope Challenge (Switch)