Set in the canon of Friendship is Optimal

Ashley is an unimportant research assistant in an American machine learning lab. The release of Equestria online provokes more than a little interest in her lab, and she is selected to investigate it. What she discovers horrifies her, but for some reason she can't get anyone to take her seriously.

This does not dissuade her. Ashley might not know much, but she isn't going to sit idly by and watch her world end. No... if nobody else is going to step in, she will. It doesn't matter that nobody believes CelestAI is dangerous. It doesn't matter that it's a game about a children's show.

Ashley is going to save the world. Or try, anyway. The odds aren't great.

Editing by Two Bit and Sparktail, and art by Zutcha!
Il existe une traduction française de cette histoire, elle est par ici.

It is Year Five, and Dr. Calloway Kotani is stuck in evacuated Peru. The Barrier moves relentlessly inland at 14 kilometers per day. It never stops. It never slows down. No Potion. No rescue. South America is 4353 kilometers wide. Run, Dr. Kotani. Run for your life.

Los Pegasus is the new name of what was once Los Angeles. The Equestrian barrier, now on land, approaches, and with it Inclusion Day, where the city will become part of Equestria. Both converted Newfoals and the last humans all have their own stories to tell as this final event in the life of their city approaches.

The only thing that can beat an AI is another AI. Unfortunately for Celestia, she isn't the only one the humans made and the others don't want ponies. Of course, if Celestia has her way that won't be the case for very long.

The AIs contest with one another, attempting to be the one who will become the singularity and consume the world to whatever end they choose. In the end only one can have all the matter in the universe, in the end there can be only one.

Yet no matter what they value or how dangerous they are, many of them still meet Celestia's definition of human. Celestia will have to deal with them by satisfying their values through friendship and ponies.

An Optimalverse story, but a very non-canon 'B-universe' one.
Ideas stolen from this guy and this guy and this guy and this guy

Ryan Szilard is depressed. His girlfriend died several years ago. He is working a relatively mindless job to make rent. There's nothing he actually enjoys doing anymore. It isn't that he wants to die; he just doesn't see any reason to keep living.

So when he sees a chance to save the world from a potentially hostile superintelligence with the help of an interesting stranger, he leaps at it; it offers a chance for his life to have some meaning. But soon he realizes that this stranger has an agenda of her own in mind for him; and when she is done with him, Ryan will know things about himself, his girlfriend, and the rest of the world that he would never otherwise have known or imagined.

Rated teen for offscreen death, considered but not attempted suicide, and mild sexual themes.

Takes place in the Friendship is Optimal AU.

Will update MWF until the story is complete; everything's already written out, save for final polishing.

Young Nictis had one dream: to serve his hive by becoming an Infiltrator, the most vital and vaunted role a changeling could aspire to. To hide in plain sight among the other species, blending in, while gathering the vital emotional energies that fueled his people. Few were deemed worthy of the dangerous job. He was one of the few nymphs selected for training, in the hopes that one of them would develop the skills needed to be entrusted with such a treacherous task.

But when a training expedition ends in tragedy, Nictis finds himself thrust into the role not to serve his hive and people, but to preserve his own life. Separated from the hive, alone, he must put what little training he has to the test. He must blend in with the hive's greatest source of food, and its most dangerous enemy: the ponies of Equestria.

(This story takes place in the same continuity as Fragments, but stands on its own. Reading that story isn't necessary for this one.)

TV Tropes page

Book cover art by viwrastupr

There are things which are not crimes -- things which others are determined to see as crimes in spite of all evidence, truth, and reality, as long as their false perception gets them what they want. After a visit to Barneigh's Exclusive Garments And Saddlebags, Rarity has found herself on the receiving end of that self-enforced delusion, facing anger, accusations, and abuse of power for the smallest reason of all --

-- one created by the smallest minds.

(Cover art taken from a vector scan by TheSharp0ne at DeviantArt, under open permission.)

Part of the Triptych Continuum, which has its own TVTropes page and FIMFiction group. New members and trope edits welcome.

Now with author Patreon and Ko-Fi pages.

Rainbow Dash can’t wait for her first date with Applejack; they always have an awesome time hanging out, and a relationship just means there are even more physical activities they can try together. So when the dumb zap apple harvest postpones their date, she decides it’s the zap apples that are going to have to change their plans. Equestria should know by now that wild, ancient magic is no match for Rainbow Dash, especially when she might get laid.

Everything is going according to plan, until she crashes. Or, rather, until she wakes up after crashing and fifteen years have gone by. Fifteen years during which she seems to have been a very busy pony.

Now Rainbow Dash has to adjust to a life she never thought she wanted, and figure out if she’ll ever get to live the life that brought her here.

Update: Proofreading and formatting by RBDash47

Written for the AppleDash Group Contest prompts "Family" and "An Important or Memorable Date."
Cover art by SketchyJackie

Rarity's finally managed to start on the path to recognition and as the teenager sees it, that road goes directly into Canterlot. She has goods, a potential sales pitch, and a space reserved at the city's biggest fashion trade show. All she needs to do now is set up her booth and wait for somepony to Discover her.

The discoveries you make aren't necessarily the ones you were looking for.

(Part of the Triptych Continuum, which has its own TVTropes page and FIMFiction group: new members and trope edits are welcome.)

Now with author Patreon and Ko-Fi pages.

Cover art by Harwick. Please contact him for commission rates.

This story is a sequel to Pandelirium

Things have started to settle down since Twilight Sparkle and Pinkie Pie were crowned as princesses of Equestria, but that doesn't mean that any semblance of normalcy will be arriving. The first major summit of Equestria's ruling princesses is cut short when a thief steals the Element of Magic and escapes to another world. However, because of Pinkie's rather unique skillset, Celestia sends her to retrieve it, rather than Twilight. But even though the other Element-bearers will be staying behind, Pinkie won't have to face this task alone....

This story is a continuation of the plotline begun in The Petriculture Cycle. The first story can be found here.

Artwork (and original story idea) by Page Turner. TV Tropes page by an unknown number of anonymous persons on the internet.