half-life
/GOD         - god mode.
/NOCLIP      - walk through walls/fly.
impluse 101  - all weapons

half-life 2
god                             - God mode (server side only)
give                            - Gives a weapon or an item (see the list below)buddha                          - Reduces your health
buddha                          - Reduces your health
hurtme #                        - Hurts the player (# is damage amount)
impulse 101                     - All weapons
impulse 82                      - Spawns a jeep
notarget                        - Player becomes hidden to NPCs
noclip                          - Walk through walls (server side only)
maps                            - Displays map list
map                             - Load a specified map (see the list below)
developer #                     - Sets developer mode to on/off/verbose
(0-off, 1-on, 2-verbose)
+mlook                          - Enables mouse look
hud_quickhelp/text? 1           - Shows crosshair
viewmodel_fov #                 - Sets the size of the weapon you're carrying
(54 is default)
exec                            - Execute a script file
cl_drawhud 1                    - Turns hud display on
cl_enablehud 1                  - Turns hud display on
cl_showfps 1                    - Shows frames per second in game
npc_create                      - Creates an NPC
(works in worlds that have an NPC entity)
npc_create_aimed                - Creates an NPC aiming away from the player.
picker                          - Toggles 'picker' mode.
setpos                          - Move player to specified origin
(must have sv_cheats 1 enabled).
setang                          - Snap player eyes to specified pitch yaw
(musthave sv_cheats).
sv_gravity #                    - Set gravity to #
sv_stopspeed #                  - Set min. stopping speed when on ground to #
sv_friction #                   - Sets world friction to #
sv_bounce #                     - Sets bounce multiplier for physically
simulated objects collision
sv_maxvelocity #                - Sets the maximum velocity of any
moving object to #
sv_waterdist #                  - Sets vertical view fixup when eyes
are near water plane to #
air_density #                   - Changes the density of air to #
dsp_explosion_effect_duration # - Sets length of confusion/ear-ringing
effect to #
prop_debug                      - Toggle bounding-boxes debug mode on/off

far cry
God mode     god_mode_count=1
All weapons  give_all_weapons=1
Ammunition   give_all_ammo=1

Quick save game at this point \save_game
Load quick save \load_game

Soldier of Fortune 1

CheatMode:
Enter these at the console. To get the console,
right-click on sof.exe in your demo directory and
choose "Create shortcut" and then right-click on
the shortcut you've created and choose "Properties".
Change the command line to add this: +set console 1

It should look something like this when finished:
"c:\....\SOF\sof.exe" +set console 1

Bring up the console by pressing "~":

Code              Result
heretic         - God Mode
phantom         - Walk Through Walls
ninja           - Enemies Don't See You
defaultweapons  - Give Default Weapons
elbow           - Give Weapons 1-5
bigelbow        - Give Weapons 6-10
matrix #        - Timescale (replace # with 1-10)
gimme X         - Spawn Object/Item X
updateinvfinal  - Gives More Ammo
killallmonsters - Kills All Enemies
map X           - Goto Level X (See Below)
kill            - ?
putaway         - ?
destroyents     - ?

Level Names:
(use with map X cheat):

trs1
trn1
arm1
kos1
kos2
kos3
sib1
sib2
sib3
irq1a
irq1b
irq2a
irq2b
irq3a
irq3b
ger1
ger2
ger3
ger4