Natural Selection 2

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Natural Selection (NS) is a modification for the video game Half-Life. Its concept is a mixture of the first-person shooter (FPS) and real-time strategy (RTS) game genres.
The game was, in 2008, one of the ten most played Half-Life modifications in terms of players, according to GameSpy.

Natural Selection 2 (NS2) is a multiplayer computer game released for PC on 30 October 2012. Mixing first-person shooter and real-time strategy gameplay, the game is set in a science fiction universe a few years after the original Natural Selection.