Here are the codes for SimCity 3000:
Press Ctrl, Shift, Alt and C, a cheat window should pop up, then type in the cheat codes.
i am weak - free buildings, roads, pipes, plants, etc.
call cousin Vinnie - get money from the 'Local Fundraising Event'
zyxwvu - Before you use this code, you have to show that you are sincere. First, use the 'call cousin Vinnie' code, but do not accept the money. Then, use this code and you will get a beautiful castle in the rewards list.
power to the masses - shows all the buildings that supply electricity
water in the desert - shows all the underwater buildings
Salt off - changes the sea into fresh water
Salt off - changes the sea back to normal
Terrain one up - raises the terrain
Terrain one down - lowers the terrain
Terrain ten up - raises the terrain ten times
Terrain ten down - lowers the terrain ten times