CivNET 
PLATFORM: PC

To activate the cheat mode (an "Extras" menu), type
CTRL A O D B A M F
in sequence at end turn. The menu contains the following cheats: 

ScaleIt : Increases your production.
ArmyInfo : See information about the other races.
MoneyAndPower : self-explanatory.
AllSeeingEye : Reveal the whole map!
GetRichQuick : self-explanatory.
GetSmartQuick : self-explanatory.
MissileCrisis : Creates the production of nuclear missiles.
SettlersHo! : Creates settlers.
Nukestorms : Causes Global Warming.
Automode : The computer moves for you.
Armaggedon : Nukes the whole world!