Command Toggle	Effect
noclip	Choose whether the player can walk through walls or not
fly	Choose whether the player is flying or not
god	Choose whether the player is in god mode or not
sv_gravity xxx	Adjusts the gravity setting (where xxx is a number between 0 and 850)
give X	Gives weapon X
impulse 9	Gives all weapons & keys & ammo
impulse 255	Give Quad Damage
map eXmY	Level Warp to Episode X, Map Y (Replace X & Y by a number)
notarget	Baddies won't touch you until you touch them
registered 1	Allows all weapons in Shareware Multiplayer games
kill	Commits suicide
color X Y	Changes players colour to X & Y (Replace X & Y with 1 number each)
name X	Changes players name to X
fov X	Changes Field of view to X (eg. "fov 180" gives a 180 degrees field of view)