The final season of Lost was split up into two realities. One was a continuation of the main timeline from the first five seasons. This timeline is the "real world" and it's this world that this article is focused on. The other reality is the "flash sideways" which is revealed to be a kind of jacob hurley bongiovi age "purgatory" (I don't know if that's the best word for it, but it's some sort of "post life" world) at the end of the finale episode.
The "flash sideways" world occurs in a place outside of time. It happens after all of the characters die, even if they die at different times (which they obviously do.)
But this article is about who survived at the end of the "real world" timeline as the show ends? Who either escaped the island for good or was still alive on the island at the end?