This month's PS Plus lineup is looking to be pretty gold - PS Plus subscribers will be able to get their hands on Bioshock Infinite and Metro 2033, despite both games only being released around a year ago.
Unfortunately, I can't really say the same for the Xbox Live Games for Gold promotion - you won't be able to grab yourself a free copy of Bioshock Infinity or Metro 2033, but if you do have an Xbox 360, and you also have Xbox Live, you'll be able to pick up Dead Island 3 for free this month, so you've got that going for you, which is nice.
Dead Island was a very enjoyable game, and if Left 4 Dead were to take more of an RPG turn, then perhaps Dead Island would be the result. If you haven't yet played through the Dead Island series, and you're a fan for Co-op games like Left 4 Dead, but also love the open nature of FPS rpg games, then definitely check out Dead Island this month.
There is also a Dead Island 2 out, which could probably be picked up pretty cheap from a retailer that sells second hand games, the second game is called Dead Island: Riptide.
If you don't fancy dealing with any more zombies this month, then on February 16th, you may instead want to download Toy Soldiers Cold War. Toy Soldiers will be the second Games for Gold title this month, and it will take Dead Island's place two weeks after the start of February.