Press Ctrl+Enter - to open Chat/console dialog. Type cheat and press enter again.

Code	Effect
freecamera	Remove limit on camera height. you can change camera angle by holding Ctrl+middlebutton (scroller) and moving mouse Ctrl+PageUp/Ctrl+PageDown to change.
res %resource% %amount%	available resource names: food wood stone gold iron coal all usage: res food 100000 res all 20000000 (will set all resource)
showallmissions	Makes all missions available.