CYBERSTORM 2 (Sierra)
Don't be put off by the fact that you've got to edit a file for this one. It's not that difficult and it's definitely worth the effort.
Right. Load up the 'STORM.INI' file in an editor (Notepad will be fine) and add the codes below (or just the ones you want). This will actually add a new menu option during the game. 
HERC BASE CHEAT CODES:
I'll Buy That For A Credit	Receive one credit
Will work for credits	1000 credits
Mo money	10,000 credits
Too much wheat	100,000 credits
You may have already won	1,000,000 credits
CUC	Mega credits
As Good as it Gets	Max-O-Repair
You da man	Max-O-Commander (Tech + Credits + Facilities)
Home is where the heart is	Max-O-Facilities
Must have!	Max-O-Chassis
He Who Dies With The Most Toys	Gain all technologies
It was nice while it lasted	Revert to normal technologies

BATTLE CHEAT CODES:
Tarsus	Heal selected pilots
It's just a flesh wound	 Repair selected vehicle 
Feel my wrath	Restock selected vehicles 
Go Go Power Ranger	Reset selected units 
Fly Away	Get Mega turn-based move points 
Vengeance is mine	Get Mega turn-based action points
Did I break your concentration	Touch of Death (one) 
That must hurt	Touch of Death (many) 
There can be only one	Invincibility
Death to all who oppose us	Destroy all enemies 
Freaky Friday	Become another player 
Let there be light v2	Fog of War: God-like 
Let there be light	Fog of War Changes