'Alien Swarm im Test: Eingängig, entzückend und kostenlos - Der Gratis-Shooter von Valve'. Download Alien Swarm on Steam Free Full version Game by Mayur Agarwal Augin Freebies Alien Swarm is a free top-down shoot-em-up shooter computer game and Source SDK release by Valve Corporation.

You may distribute your modified Valve game in source and object code form, but only for free.' ^ AlienSwarmArchived at the Wayback Machinefork on 'readme: You may, free of charge, download and use the SDK to develop a modified Valve game running on the Source engine.

^ Alien Swarm with complete code base releasing FREE on SteamArchived at the Wayback Machine on Gameranx (July 16, 2010).

^ 'Alien Swarm Game & Source SDK Release Coming Monday'.

'Valve To Freely Release Source-Powered Alien Swarm, Entire Codebase'. 'The Best of 2004 The 14th Annual Computer Games Awards'.

^ GameSpy Mod of the Year 2004Archived at the Wayback Machine.

'Valve Unleashes An Alien Swarm On Steam'. 'Free Alien Swarm Game Is So Much Fun, It's Almost Unreal (Tournament)'.

^ a b c Sterling, Jim (July 26, 2010).

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