This will be a very short and slow growing list of recs since I don't read copious amounts of fic and I have funny tastes.
Freedom is Just Another Word for Nothing Left to Lose by synecdochic
Why this must be read:
This is a Stargate: Atlantis story which is not one of my fandoms in any way shape or form. How I found my way to it is a tangled mess of links and recs and more links that were all very worth it. Whether you know anything about the Stargate fandoms or not this absolutely worth your time to read. It's a story about the fallout of a life lived in danger, in secret, in brilliance and of a last heroic decision that might be the best or worst thing ever done. The man produced is the kind of teacher few of us are lucky enough to encounter and fewer still to recognize for his worth. So. Go read it.
Seed Pearls by Honor H
Why this must be read:
Honor H has talent, dedication, and stone-cold vocabulary not often seen in fanfiction. Even still, this story stands out as a shining example of the brilliant worlds and stories Doctor who can inspire. Here, Honor H writes a world so convincing that your heart will be tugged in directions you didn't expect and you'll root for the one least likely. Gorgeous story, astounding layers, absolutely worth your time.