I know there are many giant sword mods out there, but I was wondering if anyone knows of a mod that adds greatswords that look like your standard greatsword in the first Fable game. I'm talking about the big fat swords that have a tip that flares out and is rounded on top. Not sure if there is a name for that style so if someone knows it let me know also.

The only Fable Styled mod I know of is Chainy's Fable Swords

You ought to link to a picture of what you have in mind. Those of us who have never played Fable have no idea what you're talking about.

The sword the OP is describing is http://fable.wikia.com/wiki/Greatsword.

Chainy's is indeed the only mod (at PES at least) which adds Fable swords to the game, though that doesn't include what the OP is looking for.