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.

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

Mood Wings - Observations on Pegasus Body Language.

When Twilight Sparkle finds this book, she discovers an entirely new field of research. The secrets of pegasus wings lie before her, and she insists on making her own observations on the matter.

How?

Field research, of course.

One night, an amazing display lit up the sky over Ponyville. A comet, brighter than any in living memory, was making its way through the sea of stars. The residents of the town gathered en masse to witness the spectacle. As was the tradition for such an occasion, many ponies made a wish on the celestial body, hoping that maybe, just maybe, some of them might come true...

This story is a sequel to Thrown Abroad

After the events of Thrown Abroad, Suncloak the changeling is happily living in Ponyville. Well, sort of. He needs the love of friendship to stay alive! Luckily, there's plenty of ponies who would want to be friends with him. But let's not forget about other changelings here...

You know, this would be a lot easier if the whole concept of friendship wasn't so needlessly difficult.

======================

Amazing cover art by Wolfeh! Find her Tumblr here!
Fanart!
To be found on Equestria Daily here!

Bon Bon's voice is funny, and that's about all that anypony who meets her notices, as her marefriend Lyra soon steals the spotlight with her explosive personality, strange obsessions, and curious beliefs. And why not? Bon Bon is, after all, a perfectly ordinary, boring pony in every way but two: her voice, and the carefully kept secret that she isn't really a pony.

(Edit:) Now with an annotated version, courtesy of the incomparable Shoggoth Lord!

Hello, I'm Mary. I'm a mother of two, married to the most wonderful man I could hope for and live what I consider to be, the life I've always wanted. So... why oh why, in the wide, wide world of whys, did this happen to me?

This is my story, for better or for worse, about how things in my life became beyond unbearable.

Twilight Sparkle's friends have lived long and happy lives. Now their time is coming to an end, but Rainbow Dash, at least, will not go gently. Twilight has the power to save her friend's life. Is it worth violating the natural order?

"The things that pull at your heart—the memorial in the prologue, the wedding in Chapter 1, the births and deaths and relationships to come—are not the point of the story: they are the stakes, and the story is at its heart about a decision that must be made."
—horizon

"My name is Lyra Heartstrings, and you will not remember me. You won't even remember this conversation. Just like with everypony else I've ever met, everything I do or say will be forgotten. Every letter I've written will appear blank; every piece of evidence I've left behind will end up missing. I'm stuck here in Ponyville because of the same curse that has made me so forgettable. Still, that doesn't stop me from doing the one thing that I love: making music. If my melodies find their way into your heart, then there is still hope for me. If I can't prove that I exist, I can at least prove that my love for each and every one of you exists. Please, listen to my story, my symphony, for it is me."

Cover pic by Spotlight: askspotlight.tumblr.com

This story is a sequel to A Song of Storms: Of Skies Long Forgotten

It has been twenty years since the fall of the Cirran Empire, and Commander Hurricane has led the pegasus pony tribe into a comfortable role in accordance with the Tri-Pony Compact. But a supernatural blizzard without end brings forth the suppressed hatreds that have festered among the three tribes, and the resulting famine threatens to eradicate all; earth pony, unicorn, and pegasus alike. With a bloody war looming on the horizon and the fate of their ponies at stake, the three tribes must find a way to survive together, or they will assuredly die alone.

Sequel to "Of Skies Long Forgotten." Reading of that story is not absolutely necessary to understand what is going on, but it is strongly recommended for you to understand the references.

Officially part of "The Price of Loyalty" storyverse, in collaboration with LoyalLiar

Editing by LoyalLiar and Ruirik
Cover art provided by Ruirik