The Games with Gold promotion continues for Xbox Live Gold members as December's free offerings include Gears of War and Shoot Many Robots.
From December 1 through December 15, Xbox Live members can download Gears of War free. From December 16 to the end of the month, Xbox Live members can download Shoot Many Robots free.
Microsoft originally planed to run the Games with Gold promotion until the end of the year, but recently announced the promotion's extension onto the Xbox One. The Games with Gold promotion begins to offer free games on Xbox One early next year.