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id intentionally designed Doom (and Wolfenstein 3D) for easy modification, and this foresight resulted in one of the strongest and most enduring communities to ever gather around a game (or developer).
It's a solid list I think, though I've never heard of outcast until as of recently. Lists are overdone and really don't mean anything, they are just there to collect web hits as people just argue at what is missing on there... like Fallout.