Zombie Panic! Source

Zombie Panic! Source is a multiplayer Half-Life 2 first-person shooter modification that pays homage to the popular Zombie genre of film and games. It is the sequel to the Half-Life modification Zombie Panic!, and is available to download for free.

Read more about Zombie Panic! Source:  Gameplay, History

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    We are threatened with suffering from three directions: from our own body, which is doomed to decay and dissolution and which cannot even do without pain and anxiety as warning signals; from the external world, which may rage against us with overwhelming and merciless forces of destruction; and finally from our relations to other men. The suffering which comes from this last source is perhaps more painful than any other.
    Sigmund Freud (1856–1939)