It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

WANTED:

The newly crowned Princess Twilight Sparkle has set up a bold new initiative to discover new magic, and is sending out an open call to the unicorns of Equestria to apply for her research team. No experience in magical theory or research necessary. Enthusiasm and out-of-the-box thinking a must. The Equestrian government is not responsible for any physical, emotional, or magical trauma experienced during the course of the project or the application process.

Cover art by Page Turner

This story is a sequel to Off The Edge Of The Map

When Twilight is sent with Luna on a diplomatic mission to Draconia, they quickly find themselves somewhere that doesn't appear on any map, and Luna is lost in more than one way...

Thanks to RBDash47 of Pony Fiction Archive for formatting it for submission.
Title image by Valcron

Tremendous thanks to Illya Leonov and Scribbler for the Audiobook version.
Now with a Spanssh translation by SPANIARD KIWI: https://www.deviantart.com/spaniard-kiwi/art/Apoteosis-2-3-857110089

Luna discovers something hidden from Celestia for twenty years, now, with emotions running high, she enlists the help of the Mane 6... but what seemed to be a single mystery, soon reveals a darker and much more complicated plot that will soon decide the fate of Equestria.

Check out the Empty Room TV Tropes Page (Warning: Spoilers!)

Revised chapters edits and proofing (with many thanks) by: lammy, Trevor, Nick Nack, Fifth Alicorn

Rainbow Dash never did her sonic rainboom, and while she's still friends with Fluttershy, Rarity works on a rockfarm, Applejack and Twilight live in Manehattan, and now Nightmare Moon has returned to Ponyville with no egghead there to recite the prophecy. Who will stop her? Will everypony have to learn to live with the eternal night?

In the magical land of Equestria, the night has lasted for a thousand years. But now, with the anniversary of Queen Luna's victory over her rebellious sister approaching, the Queen's most faithful student learns about a disturbing old prophecy. Can she, along with a hastily gathered group of allies, save the Land of Eternal Night from the dawn that Hellion Queen is trying to bring?

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This is an alternate-universe - or, to be absolutely precise, a reverse-universe fan-fic for MLP:FiM.
The cover image is a bit of fan art from DotRook over on dA: Dark Equestria: Rarity

Second (and final) chapter will be coming soon, once I polish it a bit.

Finding herself with wings and unusually powerful magic, Twilight Sparkle proceeds to have breakdown after breakdown, until with the help of her friends, she confronts Celestia and Luna about it... And learns that she's a far more important little pony than she ever imagined - for all the wrong reasons.

Awesome painting by Drezzer can be found here!

20 megapixel version is here (10MB JPEG, 210dpi strangely, 24"x20")!

Thanks, man!

I know, there are any number of tales out there which ask "What if Rainbow Dash never performed the Sonic Rainboom?" But my question is, "What if the day of the race happened two days earlier?" Find out how much a little change of date can make a difference!

Please note. I won't actually be addressing that exact day during the course of these first chapters. This follows where they ended up because of it, to be revealed later exactly how it all unfolded. Happy reading.

This is an idea that wouldn't leave my head, inspired by Fairy Slayer's "Mommy Nearest," Aldea Donder's "Alicorn," SoundofRainfall's "Play" and RainbowDoubleDash's "Lunaverse"

Alternate Universe: Instead of Twilight Sparkle, Princess Celestia made Rainbow Dash her personal student instead! Follow her through the events of the 1,000th Summer Sun Celebration. A reimagining of "Friendship is Magic"

Of course Rainbow Dash would have saved Fluttershy if she knew her friend had fallen off that cloud during the pegasus race. But was doing the right thing the wrong thing? Has Rainbow Dash doomed all Equestria to eternal night by being herself?