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

Celestia is trapped on Earth.
Not as a human. Not as an alicorn. She's a common horse, an Arabian mare, without her magic, voice, knowledge of the language - not even freedom, forced to work at a riding school.

What can a single Arabian mare do to get back to Equestria from this backwater European country? With only the mind of a princess and a pencil in her teeth, Celestia must find a way home.

[Illustrated] [Alternate Earth] (without Bronies)
Rated Teen for language and some scarce suggestive themes.
Proofreading by AlicornPriest

Polish language version

Eric, easygoing local human, is winding down for the night when he receives an unexpected visitor.

He is a good host to them.

Talk to someone on the telephone enough and you get an idea of what they look like.

And then you meet them for the first time, and they're not at all what you expected.

Sunset Shimmer is having the worst day of her life. She used to be important. She was the personal student of Princess Celestia. She was a future leader of Equestria. She was the kind of mare that everypony envied.

Today, it's all crashing down around her.

Alternate Universe: What if Sunset Shimmer hadn't gone through the mirror?

[WARNING: Contains ear scratching, belly rubs, and blushing cheeks]

Anonymous is sent to jail for his most heinous crimes of bullying in the second degree, there he meets a mare working as a prison guard called Cookies 'n Cream.

Written originally for the Anon in Pone Prison threads on /mlp/, which is where the OC Cookies 'n Cream (Pictured) comes from.

Suppose you found yourself in a strange body and on an unknown planet, with only a lonely dentist for company. What are you willing to do to get home? How hard would you fight? Does it matter if you're a princess or just a person?

NOTE: We've actually taken this story's concept and given it a massive makeover. Check it out here!

Two worlds. Two friendships.

However, sometimes it takes another Rainbow Dash to say what one can't.

Now with a dramatic audio reading by Goombasa! Thanks, dood! :D

After discovering that Cadence is not who she appears to be, Twilight is sent to another world entirely by the disguised Changeling Queen to avoid her plan being disrupted.
When Twilight lands, she discovers that not only have Spike, Owlowiscious and Peewee followed her, but that they've arrived in a world where the main sentient species is human.
There's still a place where they teach magic, though.
Crossover with Harry Potter. Twilight will be effectively taking the role of Hermione.

I've marked this story as cancelled to reflect the unlikelihood of it continuing. If I do come back to it I'll revert that.

THIS STORY IS BEING REWRITTEN. THEREFORE IT IS NOT COMPLETE.

My name is Seth Rogers. I'm a simple college student trying to get a degree so I can land a good job. However all of that goes out the metaphorical door when I encounter a strange man adorned in half-plate armor. Before I know it, I'm in an unknown land filled with ridiculous looking ponies colored every shade of the rainbow. Or all of them, in one case.
...
I want them to stay as far away from me as physically possible.

This is a Human in Equestria story with shounen elements. The twist is this: the main character, a bitter and troubled young man who doesn't believe in kindness or friendship, experiences the very same lessons that we have in the process of watching this incredible show. Can the ponies we all know and love help Seth become a better person?

Another thing that I must point out is that the show does not exist in the human world. Stay tuned, as character development is the goal of the whole story.

Book I: The New World: Chapters 1-7
Book II: The Meaning of Friendship: Chapters 8-19
Book III: To Canterlot: Chapters 20-33
Book IV: The Royal Wedding: Chapters 34-57
Book V: Forgotten Memories: Chapters 58-86
Book VI: The Return of the Crystal Empire: Chapters 87-End

There is now a Sequel: A Wilting Flower

Cover Art by https://chapaevv.deviantart.com/
Illustrations by icecapers
Edited by Castwing, Schadenponi, Brave-Hooves, Insidiaphilia, scaredofbs, ScootalooFTW, and Vayne Hellslinger

Feel free to come join us and keep up to date on all story news at https://discord.gg/YzuSAEC