HEXEN
 demo version cheat codes
bgokey            - God mode; can't be injured, except in teleport frags and
                   when falling from extreme heights
ebiessman         - Pig mode; turns player into pig w/ 30% health
cstika            - Carnage; kill all monsters on level
sgurno            - 100% health
crhinehart        - All Weapons, full Mana, full Armor
mraymondjudy      - All Keys
braffel           - Full Inventory; max. 25 of each artifact
tmoore            - All Puzzle items
rjohnson          - No clipping (walk through walls)
bpelletier##      - Warp to level ## [01-04]
                    (does not deactivate '-nomonsters' command line option)
init              - Reload level from disk
plipo[0-2]        - Change player class: 0 = Fighter, 1 = Cleric, 2 = Mage
mwagabaza##       - Run script ## [01-99]
jsumwalt          - Display map ## & x/y/z co-ordinates in decimal notation
rrettenmund       - Display fps dots (fps = 70 / <dots+1>
kschilder         - Display sound debug info
pmacarther        - Display version info
reveal            - Toggle map detail (can use in Map Mode only; repeatable)
                    3 modes: normal -> all walls -> all monsters (-> normal)
quicken           - 1st time: "trying to cheat? that's one...";  2nd time:
                    "that's two...";  3rd time: "that's three! time to die."
rambo             - "cheater - you don't deserve weapons"
wewin             - disabled (wins the game; only in first demo version)

                                 HEXEN
                       full version cheat codes
satan             - God mode; can't be injured, except in teleport frags and
                    when falling from extreme heights
deliverance       - Pig mode; turns player into pig w/ 30% health
butcher           - Carnage; kill all monsters on level
clubmed           - 100% health
nra               - All Weapons, full Mana, full Armor
locksmith         - All Keys
indiana           - Full Inventory; max. 25 of each artifact
sherlock          - All Puzzle items
casper            - No clipping (walk through walls)
visit##           - Warp to level ## [01-31,41]
                    (does not deactivate '-nomonsters' command line option)
init              - Reload level from disk
shadowcaster[0-2] - Change player class: 0 = Fighter, 1 = Cleric, 2 = Mage
puke##            - Run script ## [01-99]
where             - Display map ## & x/y/z co-ordinates in decimal notation
ticker            - Display fps dots (fps = 70 / <dots+1>
noise             - Display sound debug info
mrjones           - Display version info
mapsco            - Toggle map detail (can use in Map Mode only; repeatable)
                    3 modes: normal -> all walls -> all monsters (-> normal)
martek            - 1st time: "trying to cheat? that's one...";  2nd time:
                    "that's two...";  3rd time: "that's three! time to die."
conan             - "cheater - you don't deserve weapons"
~##               - Play track ## of a CD


That's all I've ever found.