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

Beyond Earth and beyond the Universe within which Earth exists there is a place full of love; the richest mine of love that can be found, as it is seen by those capable of utilizing it...

Within that place, specifically a part of it called the Everfree Forest, awakes one such creature: a Changeling; specifically, a Changeling who had been a human on Earth the day before. How will he survive in a body that literally needs love for nourishment, while in a world that is now wise to the Changelings' tricks and has branded them evil? Better question: Will he be able to change more than his physical appearance?

These questions are not the only thing that will plague him, for the hows and whys of his arrival and transformation are in a hurry to reveal themselves, and Equestria's heart will stop as it waits for its fate to be decided.

Now with a side story (with more to come) from other characters' POV!
POV: MANE SIX

Now Featured on Equestria Daily!
TV Tropes and a group of its own.
Audio version
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Three Nights in Manehattan, a sequel
Hardcover Print-on-Demand Order Page

As a child, Daphne knew of a world where magic lived, where an immortal princess reigned over a beautiful kingdom, and longed to journey there beside Leit Motif, the filly she'd grown to love in the woods behind her home. But one day, when she needed her most, Leit Motif was gone, and she never came back to show her the way. As she grew, she put aside her childish dreams, and taught herself to believe the lie.
When forces beyond her knowing take her sister Amelia, though, she discovers that her childhood fancies were entirely too real, and is thrust into a journey that will take her back to that land she longed for, back to the childhood friend she'd abandoned, and to worlds she'd only dreamed of.

Interview with Pre-Reader Amacita
PresentPerfect's Review

The Mare in the Moon has returned, and the dark power that created Nightmare Moon is awakening again with the aid of a magical Moonstone. The two princesses and the Mane Six must use the Elements of Harmony to banish the darkness once and for all. Meanwhile, on Prehistoric Earth an alien artifact identical to the Moonstone falls into Predacon hands. What does this mean? And what will happen when a rift in space is opened between the two stones, pulling the Transformers into the strange, new world of Equestria?

(Note: It gets dark in places, but there is no explicit violence or gore.)

This story is a sequel to Memory Pending

The story of Moon Mender continues after his dream of an ending ceases. He continues his struggle to belong in a world so far divorced from the only other experience he can remember, but as an outsider of truly alien mindset, will he ever be able to find a place in Equestria? More importantly, will the life he left behind give up on its death grip so easily? The most important thing to remember is that things are rarely as they seem and sometimes, some things are better off forgotten.

This story is a direct sequel to Memory Pending. Without having read that, this story might be a little strange to most, which is frightening considering how strange it is already. It can be read as a standalone story of course, but you won't get the most out of it.

Further, I’m fully aware that not everypony enjoys more mature themes, so any scenes containing things of an M rated nature shall only be released in a separate story when the time comes. This story deals with more mature themes on a whole, as a warning. This version will do its best to censor the really sensual or graphic content out, of course.

Last but not least, this story has reached this final format through combined efforts of not just myself, but many a helpful pony along the way! Here’s an abbreviated list of those involved and the rolls they played:
Kiroberos – Author (Obviously)
Julia – Editor (Corrections, Grammar, and Flow)
Azu – Beta Reader (Corrections, Flow) (Until Chapter 35)
ExplosiveBrohoof – Beta Reader (Grammar) (Until Chapter 22)
Muffinking – Beta Reader (Corrections, Grammar) (Until Chapter 22)
All of my readers for being amazing, supportive, and best of all, enjoying the world we read and write about.

Once, Ford was just a human who led a boring and lonely life. But suddenly, his life is turned upside down as a mysterious golden light not only transported him to the magical world of Equestria, but has also transformed him into a Pegasus Pony without a Cutie Mark! Despite how much of a fan he is of MLP:FIM, he can't help but feel concern on what kind of consequences his presence might bring on account of his knowledge of a fictional cartoon show.

Now, under the identity of "Ford Mustang", he must face many trials ahead of him. Will he be able to blend in with the rest of the pony community? Will he ever be able to earn his Cutie Mark? Can he make it back home in time before the ponies learn the truth about him? And what happens when he starts to fall in love with a certain cyan Pegasus with the spectrum-colored mane? Find out on the incredible journey of Ford Mustang!

Spike only wants things to stay the same. Time, however, has other ideas. He's going to need a lot of help... An everypony story.

(Cover image by Rannva)

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

Curious about Five Score? Come check out the story that inspired dozens of side fics and been enjoyed by bronies for years!

Original Synopsis Even though MLP:FiM ended a few years ago, my friends and I still loved the show. Stories, merch, fan art, I loved it all. Things started to get a weird though when I found myself with a cutie mark appearing on my leg. Humans aren't supposed to get cutie marks, so where the heck did this come from? And what's going on with my hair?

More Detailed Synopsis: Five Score is an action/adventure story of the human-to-pony transformation genre. It’s unique from most transformation stories because the transformation itself is not really the point of the story. It’s the inciting incident that raises countless challenges that must be resolved. They are on earth, as a pony, and need to fix this before things get worse. Think about yourself in their hooves for a moment. How are you supposed to change back or even figure out what caused it in the first place? How are you supposed to get food or do anything on Earth without being spotted by humans? If you are spotted or captured, how would you escape? How does one even open a door with hooves!? Did anyone else on Earth get changed as well? How could you get the word out to the other ponies who are themselves hiding? Is it worth risking travel across the country to reach the others? Which of your friends would you trust to help you deal with this? And why did you turn into this particular pony? Surely it wasn’t random chance, right?

These challenges are the tip of the iceberg in this full length adventure novel There’s a lot of humor, many tense scenes, and hell maybe even a war.

But don’t just take it from me, Look what random people on the internet are saying about Five Score, Divided by Four

One of the best things to come out of this fandom.
-IrraticDrop

This made me change how I think about fictional worlds, imagination, and creativity
-relgukxilef

The only story on FimFiction to have me literally shaking with excitement.
-jeramiahsental

SWEET FILLY LUNA I AM FLIPPING MY SHIT RIGHT NOW
-Shadow Reaper

Five Score master editor:
Scrub

Five Score proofreaders:
Comrade Sparkle
Rustle my Jimmies