This list is now outdated and the better reference place to track preloaded tunes and hp/tq gains is the official sct website. However this page is still very popular so I'll leave it viewable.
Here is the Ford Preloaded list of supported vehicles that comes on the Livewire, SF3, and TSX. Note, this is not the custom tune support list, this only shows what tunes come preloaded from SCT on the applicable programmers. Also note that Vehicle condition, modifications, and quality of gas will cause results to vary.
If your vehicle is not listed here, or if you are just looking for a custom tune, click here for the custom tunes page. Which by the way is pretty much all Fords 96 and newer.