For Wolf3d you can go into Debug mode
type -goobers in the command line. then when playing press "left shift" "alt" and "backspace" at the same time to enable debug mode. Then hold TAB and press any of the following letters.
B=Change border color
E=Skip two levels
F=Displays coordinates
G=Toggle God mode
H=Lose health
I=Free items
M=Display memory usage
P=Pause without message
S=Toggle slow motion
T=View graphics and play sounds
V=Add extra VBLs
W=Level select
X=Extra stuff