Start a server with cheats enabled using the devmap command in the console.
Ex. "D:\games\Quake III Arena\quake3.exe" devmap dooctf2

Once in the game, go back in the console and type any of the following: 
 
Most of these codes are self-explanatory.

give all = get all weapons + the grappling hook
give health 
give armor 
give quad damage 
give personal teleporter 
god
give gauntlet
give machinegun
give shotgun
give grenade launcher
give rocket launcher
give lightning gun
give railgun
give plasma gun
give bfg10k
give grappling hook
give ammo

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