Plot: Tremulous is a free and open source asymmetric team-based first-person shooter with real-time strategy elements. Being a cross-platform development project the game is available for Windows, Linux, and Mac OS X. The game features two opposing teams: humans and aliens. Wikipedia
Plot: JFK Reloaded is a historical simulation video game, designed to recreate the assassination of John F. Kennedy. It is noted for its controversial subject matter, and was released November 22, 2004 by Scotland-based Traffic Games. Wikipedia
Plot: Nuclear Dawn is a post-apocalyptic first-person shooter real-time strategy hybrid video game. It was originally announced in February 2006 as an amateur mod for the Source engine, but in April 2009 was revealed to have become a commercial project, still using Source, aimed at Windows PCs and Mac OS...
Plot: Special Force is an online free-to-play first-person shooter developed by the South Korean game developer Dragonfly. Dragonfly continues to expand the game around the world and plans to expand into the Middle Eastern, Indian, and Russian markets. The Indonesian version of the game was discontinued...
Plot: Alien Arena is a free, stand-alone first-person shooter computer game. Begun by COR Entertainment in 2004, the game combines a 1950s-era sci-fi atmosphere with gameplay similar to the Quake, Doom, and Unreal Tournament series. Wikipedia
Plot: Under Ash is a first-person shooter sometimes explained to be a response to how Arabs are pictured in video games in general and America's Army in particular. Like America's Army, it is considered to be video game propaganda; however, it differs from America's Army in that it is not available free....
Plot: Marine Doom is a 1996 modification of the first-person shooter Doom II for the United States Marine Corps, which was later made available for download to the public. Wikipedia
Plot: The Crossing is a cancelled first-person shooter video game by Arkane Studios, which attempted to fuse single-player and multiplayer by threading its single-player campaign through live multiplayer games. Wikipedia
Plot: Full Spectrum Warrior is a real-time tactics video game developed by Pandemic Studios and published by THQ for Xbox, Microsoft Windows and PlayStation 2. A sequel titled Full Spectrum Warrior: Ten Hammers was later released. Wikipedia