FearLess Cheat Engine

Here is a Doom 1 & 2 cheat table.
Basically invulnerability and one hit kills.

Have fun with it, even if you don't.

Edit:
you must start the game *before* you use the table

Edit again:
this is supposed to work with DOOM 3: BFG Edition,
not the Bethesda one I guess, only the Steam one has been tested.