Deus Ex Alpha

First, use the console (~ key) and type in "skulgun".
The cheat-codes are:

conspiracy
deus
ghost (type it again to walk)
camo
giveitems
ammunition
allaugs
allpower
allskillpoints
allskills
allcredits
allperks
allhealth
slomo 2 (or any other number, 1 - to restore the game speed)
thirdview 1 (0 - to restore camera position)

Some of the DX's cheat codes should work as well.

Some of the classes for "summon":
WeaponAug
WeaponSpecialColtCommando
WeaponSpecialAK47
WeaponSpecialM23
WeaponPlasmaGun

To summon a Deus Ex class, type "deusex." before its name (summon deusex.seagull).

New aug classes (to use with augadd):
AugTime
AugEMPShield