1. Day of Defeat by Activision

Day of Defeat (a.k.a. DoD) is the latest online action experience from Valve, makers of Half-Life and Counter-Strike. Day of Defeat is a 3D multiplayer shooter that simulates squad-level infantry combat between the adversaries of World War II’s European Theatre; the Allies or the Axis Powers. The goal is to complete various mission objectives.
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2. Call of Duty: Game of the Year Edition by Activision

Call of Duty delivers the gritty realism and cinematic intensity of World War II’s epic battlefield moments like never before–through the eyes of citizen soldiers and unsung heroes from an alliance of countries who together helped shape the course of modern history.
The majority of the games in the series have been set primarily in World War II, with the exception of Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2, which are set in modern times.
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3. Call of Duty (Mac) (DVD Rom) by Aspyr Media

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4. Medal of Honor: Allied Assault by Electronic Arts

Battle in over 20 missions as you accomplish yor mission objectives and turn back the Nazi tide.
Over 21 different historically-accurate weapons — from mounted machine guns to flame-throwers to stick grenades.
Fully interactive environments allow you to use terrain as an advantage and destroy whatever is in your way.
Special disguise mode lets you wear enemy uniforms and sneak around.
Realistic battle action in the days of World War II!
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5. Battlefield 1942

Battlefield 1942 is a 3D World War II first-person shooter (FPS) computer game developed by Swedish company Digital Illusions CE and published by Electronic Arts for Microsoft Windows (2002) and Apple Macintosh (2004).
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source: amazon.com,wikipedia.org

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