While marketing Strands of Fate, there is one selling point that I feel hasn't gotten the attention it deserves.
For one, Strands was designed from the beginning to be able to stand on its own two feet. It is a complete game in and of itself, using the FATE game system to allow you to play any sort of campaign you can imagine.
That said, it also fills a secondary role as a 3rd party supplement for other FATE games. Because they share the same core system, and because of Strand's "toolbox" design, it's very easy to mix and match optional or alternate rules found in Strands of Fate with other FATE games.
Strands offers a vast array of options, including three separate Stress and Consequence systems, two equipment and wealth systems, vehicle creation and conflict, large scale conflcit, the Powers system, called shot rules, persistent Aspect rules, and a lot more. All of these things can be dropped into other FATE games like the Dresden Files RPG, Diaspora, Starblazer Adventures or Legends of Anglerre with little or no fuss.