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Hitman

First, go into your Hitman directory and open the "Hitman.ini" file.

You should see this:

Include Setup\Locale.zip
//DrawDll Render3DFX.dll
DrawDll RenderD3D.dll
//DrawDll RenderOpenGL.dll
SoundDll Sound.dll
ScriptDll GSC.dll
LocaleDLL Locale.dll
Resolution 1024x768
Anisotropy 0
ColorDepth 32
ShadowDetail 2
TextureResolution 0

After the last line in the Hitman.ini file, in this case "TextureResoultion 0", add "enableconsole 1".

Save it, then run the game.

Activate the console by pressing ~.
Type the following to activate:
god 1/0 - God Mode (this is a toggle, where 1 is on, and 0 is off)
invisible 1/0 - Invisible to AI ( (this is a toggle, where 1 is on, and 0 is off)
giveall - Gives you all weapons/items from the current level
infammo - Infinite Ammo

What do toggles do?  An example would be typing in "god 1" in the console would mean turning God Mode on.  Typing in "god 0" would mean that God Mode is off.