Fate is simple enough that it can adapt to anything, but not necessarily it runs smooth or with the necessary flair. I just found a system that it is very similar to fate, more or less a mix of Fate and Hero, but it is completely hackable to the needs of your setting. Currently I am reading the rulebook of Cortex Prime, but it seems a lot better than Fate (hard to tell only reading), and easy enough that a Fate player can play it very easily.
GURPS was suggested to me once, but it is a very complex system.