Brutal Doom fixes one of the problems in the original Doom, namely the use of the wrong colors on medikits. While Doom on its own ignorantly uses the Red Cross symbol, if you add Brutal Doom to your game, it’s turrned into the correct first aid one:
That makes Brutal Doom not only better than vanilla Doom in every way, but also more accurate than the latest Doom outing, Doom Eternal.
Brutal Doom is available for free at ModDB but requires original Doom WAD files to work.