Stop what you are doing and read these now

Hard Reset Twilight gives her life to stop a changeling invasion. Repeatedly. by Eakin 36,358 words · 8,208 · 134
My Little Metro After Doomsday forces ponies underground, a lone colt braves the Stalliongrad metro system to save his people from an unknown threat. by redsquirrel456 232,320 words · 239 · 9
Anthropology Lyra is determined to find out the truth behind the mysterious legends of humans. by JasonTheHuman 130,415 words · 8,482 · 175
Stardust Can Twilight earn the trust and friendship of people who are by nature suspicious and hostile to anything that isn't 'human'? by Arad 216,600 words · 6,189 · 103
See the Zone and Survive Two veteran stalkers help out the celestial alicorn princess, lost in the Zone and almost completely stripped of her magic. One thing leads to another and adventure happens, whether they want it or not. by RoadRunneR 115,774 words · 778 · 48

Now dammit.

Some favourites

Alabaster Vinyl Scratch visits her father. by DawnFade 2,165 words · 840 · 8
Fallout: Equestria - Memories One crazy pegasus, one roboleg, a contingent of Steel Rangers, and an adventure of infinite detours. Put all that together and what do you get? A rip-roaring mosh pit wrecking its way across the Wasteland, leaving nothing but confusion in its wake. by TheBobulator 386,808 words · 902 · 64
The Nightingale Effect A griffon psychologist, assigned to help Princess Luna recover from her time in exile, develops feelings for his patient. [LunaxOC] by N00813 38,659 words · 202 · 7

The Ecstasy of Defeat The Griffin Empire has always been a place of dictatorship and repression, despite the recent revolution. Things have only gotten worse. It may be illegal, but escaping may be one griffin's only option. It's definitely not a good one. by AgentSnail 66,265 words · 78 · 4
The Dusk Guard Saga: Rise Steel Song is a lot of things. Earth pony. Uncle. Professional bodyguard. Retired. So when he receives a mysterious package from Princess Luna, he's understandably apprehensive. Things are never as they seem in Equestria... by Viking ZX 267,176 words · 948 · 23
Fortitude Amicitia The Dusk Guard's first joint operation alongside XCOM turns out to be far more complex than anyone anticipates. (Stardust/Dusk Guard crossover) by Arad 18,661 words · 1,512 · 46
ARTICLE 2 An alien crash lands in Equestria. It calls itself human. by Muppetz 228,756 words · 5,174 · 177
Of Ponies and Papers A portal to Equestria opens on Arstotzka's border, and you now have to deal with pony immigrants along with the usual mix. by The card holder 11,713 words · 879 · 14