If you all haven't heard of Red Crucible 2 yet, it is a F2P First Person Shooter that you can play in your browser or use a standalone client on an iMac. It seems like Battlefield and Call of Duty thrown together in the same recipe. It's a really fun game with a variety of map sizes and graphics options! I believe it was released in 2012.
http://www.kongregate.com/games/rocketeergames/red-crucible