Press [Ctrl] + D during game play then enter one of the following codes.

Effect                                               Code
--------------------------------------------------------------
Return to Fort Avernum                             - backtostart
All characters no longer appear on automap         - dontshowmeall
Character editor                                   - editor
All areas forget most of your crimes               - forgiveme
Display frame rate                                 - fps
Main character gets cake                           - giveasnack
Recharge spell energy                              - iamdrained
500 coins                                          - iampoor
Learn info from the dragon Athron if already dead  - ikilledathron
Get experience                                     - iwanttobestronger
Each characters gets multiple blessings            - leetbuffz
Heals and cures your group                         - ouchouchouch
Cures characters suffering from mental effects;  
removes death curse                                - owmybrains
Return all boats to starting positions; boats
previously purchased will no longer be your 
property                                           - resetboats
All characters appear on automap                   - showmeall