It depends on the game. WWII GI uses an enhanced version of the Duke3D engine. I think EDuke 2.1 can run it, at least that's what the Raze team used to add NAM and WWIIGI compatibility. I would have to compare it with the original 1.5 source release and hand pick all the new features.
JonoF has a "no effort" port of Witchaven, so that should be easier, but I have no idea what state that port is in. It might still be in an early stage of development.
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