The co-op multiplayer alien shooter has you playing as gruff and tough space marines, equipped with a number of futuristic weapons and equipment, as they take on hordes of swarming aliens. Hence the name.
Alien Swarm started its early life off as an Unreal Tournament 2004 modification. The development team, later picked up by Valve, went on to develop Left 4 Dead 2 and are currently working on Portal 2.
As said, Alien Swarm for Steam is totally free. Just boot up Steam and prepare yourself for a ~2GB download. With four player co-op, 64 achievements, and an unlockable alien bug hat for Team Fortress 2, this is one tasty treat not to be missed.

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