multiple intances of great fortitude

[Hopping Vampire]

are multiple intances of great fortitude and the like feats possible?

 

[Caliban]

are multiple intances of great fortitude and the like feats possible?

Multiples of the same feat won't stack unless they specifically say they do (look at Toughness).

 

[AGGEMAM]

are multiple intances of great fortitude and the like feats possible?

No, but there is Epic Fortitude.

 

[Crothian]

And Mercanaries by AEG has second teir feats for all the saves that requre the PHb version as a prerequite

 

[Destil]

*waves a what Caliban said flag*

Moreover, as a general rule you can not take a feat more than once. Exceptions to this rule are generaly listed in the Special entry for the feat. In the main PH list (table 5-1 on PH 79) feats marked with * can be taken more than once, but for diffrent spell schools, weapons et cetera. Feats marked **(toughness and extra turning) can be taken more than once, and the benifits stack.

Some psionic feats have special rules that allow you to take them more than once, stack the effects and increase the PP reserve nessessery.

EDIT: I can catch spelling errors in latin, but not english. Heh.