During the game, press Alt+Shift+D to bring up a text box, then just type in the codes!

owmybrains Cures any character that is frozen or suffering from a mental effect.
dontshowmeall Disables the showmeall cheat.
leetbuffz Fully buffs your entire party.
iwanttobestronger Gives you XP.
pleaselikeme Makes all of the areas in the game forget your crimes. If you were hated, you will now be liked. Major crimes won't be forgotten.
ouchouchouch Restores your party's health.
imdrained Restores your party's spell energy.
backtostart Returns you to Fort Monestary.
showmeall Reveals hidden NPCs on your minimap.
giveasnack Spawns a cake in the selected character's inventory.
dontshowmeall Stop making all characters appear on your automap.