999 units of ammunition for current weapons
Type "allammo" at the console window.

Access console window
Push [Tab], accent [`], or tilde [~] during game to open the console window. The following cheats (and those found in the readme file) are entered at this window.

Third person view
Type "behindview1" at the console window. (Note: Type "behindview0" to return to first person view.)

Reset bad textures on walls
Type "flush" at the console window.

First person view
Type "behindview0" at the console window.

Fly mode
Type "fly" at the console window.

Walk through walls
Type "ghost" at the console window.

God mode
Type "god" at the console window.

Hide all items, monsters and weapons
Type "hideactors" at the console window.

Show all items, monsters and weapons
Type "showactors" at the console window.

Invisibility
Type "invisible1" at the console window. (To disable, type "invisible0".)

Disable invisibility
Type "invisible0" at the console window.

Slay all selected monsters
Type "killall monster_name" at the console window, where monster_name is a character race or class.

Disable timer
Type "playersonly" at the console window.

Set game speed
Type "slomo#" at the console window, where # is the desired speed. (Note: The default is "slomo1".)

Play specified music track
Type "cdtrack#" at the console window, where # is the track number.

Open maps quickly
Type "open map_name" at the console window, where map_name is the name of the desired map.

Create item, monster or weapon
Type "summon object" at the console window, where object is the desired item.
Here are a few examples:

assaultrifle
combatarmor
combatgoggles
communicator
health
palmkkey
passcardkey
particlecannon
retinalkey
rocketlauncher
vacsuit