FFVII: REBIRTH is a free modification for the PSX classic, that seeks to rebalance the game, improve the difficulty level, add new spells and mechanics, and in essence make the game a more engaging, tactical experience. REBIRTH is unlike other modifications of its kind, insofar as it is for the *PSOne* version of the game, though a PC port will follow.
"Defense" =P
Well, technically, that's how we spell it in the UK.