Battlefield 4 DLC maps are all free right now through Monday:
You do not need to own the base game to claim the DLC, so I highly recommend going to get them. BF4 goes on sale all the time (I think for as low as $5), and the game is awesome now. There's still a ton of people playing and lots of servers to choose from.
Also, Ubisoft Club's free game of the month is The Crew. It's an open-world racing game. I haven't played since the beta, which I reviewed somewhere around here. By now I'm sure they've improved the game, and free is free! You don't even have to install the game. Just go claim it, and it's yours forever. They'll be giving away more games in the future too.