Console Cheats
During gameplay, press CTRL + ALT + ~ to bring up the console. Enter in any of the follow codes to activate their effects.

Code	Effect
give keys	All keys for the current level
give all	All Weapons, Ammo, and Armor
spawn monster_flying_forgotten2	Another "Forgotten" spawn code.
give ammo	Fills your ammo to the maximum
give armor	Fills your armor points to the maximum
give health	Fills your health points to the maximum
noclip	fly around and walk through walls
give weapon_shotgun_double	Get the new double-barrel shotgun.
give weapon_grabber	Get the new grabber gun.
give ammo_grenade_small	Gives you Grenades
give weapon_bfg	Gives you the BFG 9000
give weapon_chaingun	Gives you the Chaingun
give weapon_grabber	Gives you the Grabber
give weapon_machinegun	Gives you the Machine Gun
give weapon_plasmagun	Gives you the Plasma Rifle
give weapon_rocketlauncher	Gives you the Rocket Launcher
give weapon_shotgun	Gives you the Shotgun
god	God Mode (Invincibility)
give PDA	PDA Given
map game/marscity1	Play through main game (can give self new weapons, but chainsaw and soulcube are undefined, and Bloodstone doesn't work).
spawn monster_flying_forgotten	Spawn a "Forgotten" skull monster.
spawn monster_demon_d3xp_bruiser	Spawn a bruiser demon.
spawn monster_zombie_hazmat	Spawn a hazmat zombie.
spawn monster_demon_vulgar	Spawn a vulgar demon.
spawn monster_hunter_helltime	Spawn the first of three hunter demons.
spawn monster_hunter_berzerk	Spawn the second of three hunter demons.
spawn monster_hunter_invul	Spawn the third and final hunter demon.
map game/deltax	Start a new game in Delta Labs - Unknown.
map game/phobos#	Start a new game in Phobos Sector # (1 to 4).
map game/erebus#	Start a new game on Erebus Level # (1 to 6).
map game/hell	Start a new game on the final Hell level.
give weapon_bloodstone_active2	Upgrade Bloodstone to do Hell Time and Berserk.
give weapon_bloodstone_active3	Upgrade Bloodstone to do Hell Time, Berserk, and Invulnerability.
give weapon_bloodstone_active1	Upgrade Bloodstone to do Hell Time.

Contributed By: DV Morpheus, sdunigan, motu8282828, chinchenzo

Storage Locker combinations
There will be quite a few times in Doom 3: Resurrection of Evil where you will find various Storage Lockers in the facility. You can find the codes from various peoples' PDA's, but here's a quick reference. The first number will be the Storage Locker number, the second will be the combination required to open it.

Code	Effect
#042 - 714	Box of Shotgun Shells, Chaingun rounds
#035 - 134	Bullets, Shotgun Shells, Armor Shards
#105 - 769	Bullets, Shotgun Shells, Hand Grenades
#407 - 937	Bullets, Shotgun Shells, Small Medikit
#034 - 134	Chaingun rounds, Machine Gun ammo
#029 - 516	Machine Gun ammo, Security Armor
#408 - 937	Shotgun Shells
#116 - 634	Shotgun Shells, Cells
#117 - 634	Shotgun Shells, Chaingun ammo