Veteran PC gamers know: The best games are an investment. That's because the people who love them will use them to make their own custom models, skins, game modes, and even completely new games--all of which you can download and play for free.
Doom 3 Duct Tape mod is legendary! why id did not have flash lights mounted on guns in their dam dark ass game is beyond me. Thank You to all the modders!
No battlefield? It had the Project Reality mod in bf2 which basically turned it into a multiplayer war simulator. How about forgotten hope for bf2, it made a modern warfare game into a WW2 era game that is better than most ww2 games today.
ah... Zombie Panic Source, I think is the best mod for anything ever.
Decent list. It was surprisingly varied--most lists like this are just the author's favorite games, but you've managed to actually hit the concept home.
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