While playing, press [~] (tilde) to bring down the console, then type any of the following codes:
Code: toggle_fow
Fog of War on/off.

Code: bestbuy
Units are 10% cheaper.

Code: add_money #
Add money. # = amount.

Code: add_population Y X
Adds population, where Y is the settlement name and X is the amount.

Code: auto_win attacker/defender
Attacker or defender automatically wins the next auto resolved battle.

Code: create_unit settlement/charactername unit_ID amount exp/armour/weapon
Creates a unit in the selected settlement or characters army with the stats you input.

Code: process_cq settlement
Finished the building queue in the settlement.