not in one place (I guess this topic could be it)
enter the console with ~ or F10
and enter one of these commands:
BEE - invincible mode
GUTHOOD - full weapons and ammo
LAB - all keys
HAX - kill all enemies
UNHAX - resurrect all enemies (minus the ones that exploded)
MAP - teleport to map e.g. MAP war or MAP e1m1
the rest are mostly for debugging e.g.:
STATS - display rendering stats
DEBUG - enter debug mode - in this mode you can hold down Ctrl to go through walls