SF (canon species only; no humans) Ponies were magically and genetically engineered to be the perfect servitor race. They are powerful, adaptable, intelligent and completely under the control of their creators. A laboratory accident frees one such pony from her mental chains, but how can one mare save herself and the rest of her kind if she doesn't even know she's a slave?
This is not the Equestria you know and these are not your little ponies... not yet, anyway.

Tags: Adventure, Diamond Dogs, Gryphons, NO HUMANS (did I mention that already?)
Other tags: historical, mind control, Clarke's 3rd Law, excessive use of high energy physics, before they were famous.
Detailed review by PaulAsaran.
Cover art by endrome , used with permission.
Russian translation (partial -- 'unofficially' completed in the comments)
A Soot-Covered World, book 1.

In a year marked by the greatest number of legal assaults on the rights of trans people to exist that has ever happened, this is my contribution to Pride Month for 2021 - my own, personal, real life transition story, ponified and coated in science fantasy. I took a metaphorical sword and sliced open my guts for you to see, raw and bleeding. This is my life, this is my story, painted in ponies. Petal Chatoyance says: Trans Rights!

In the wake of the Canterlot Wedding, Fluttershy has to ask Twilight a very difficult question.

Now available in spanish! Spinoff stories can be found in Would It Matter If I Made This Group?

Now with a TVTropes page.

[Complete! With TVTropes apparently!]
Also, apparently, an animated trailer.

In a world of brass and steam, Twilight Sparkle had thought she had made a life-changing discovery with the invention of the telescope. For better or worse, she was correct.

Now her discovery has not only changed her life, but the lives of those she seeks out in her desperate attempt to contact the only other creature as lonely as Twilight herself.

It all would have been much simpler, but it had to be the one Twilight could only call The Mare on the Moon.

Decidedly not within walking distance, then.

[Featured on EQD before story was meant to be submitted. 4/03/2015]

[Editing team: Southpaw, Wolfvenom, Maskedferret, SwanSong and BluePaladin42, without whom this story would be a fraction of its current state.]
[Special thanks to Novel-Idea for the updated cover]

For the first time ever, Derpy Hooves is taking the day off. Why would such a hard-working mailmare abandon her duties? That day, when Dinky comes home from school, her mom's strange behavior leads her to discover something that will change both their lives.

NOTE: This is a story from the fandom's early days, written during season one. This portrayal of Derpy is based on early fanon about her personality and nature. It's not meant to contradict the canon personality she eventually got.

After a mirror portal field trip being conducted by Luna goes terribly wrong, Ocellus finds herself trapped in a strange palace far from home. That palace, once abandoned, is now infested with a hive of love-starved changelings intent on using her only way home as a means to invade her world.

Otherwise, Ocellus appears to be alone.

At first.

The story is inspired by, and a homage to, my favorite game of the last decade. However, this story is neither a crossover nor AU. This story is set after "The End of the End" (but before "The Last Problem"), and is purely a My Little Pony story. Warning: rudeness and intolerance are not allowed in the comments, but spoilers are. Exercise discretion. Remain polite and on-topic. And please enjoy the story!

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

Yaks are one of the most durable sapient species on the planet, a fact in which they take pride.  They have colonized mountains towering beyond the reach of even dragons’ wings. They smash the toughest objects the mountains have to offer for fun.  They don’t settle for second place.

Naturally, they didn’t take it lightly when they heard of Equestria’s plans to explore beyond the sky.

Rocket scientists beware: Heresy dwells within.

My thanks to Bugsydor and Akouma for some idea-bouncing and proofreading. Similarly, big thanks to Rocket Lawn Chair for making an awesome cover. Turns out, there's not a lot out there that includes yaks and rocket science.

My entry for FanOfMostEverything's Imposing Sovereigns II contest under The New: Prince Rutherford.

Now with a French translation! (Credit: Acylius)

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

"Suppose I killed them all?"