The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

When Octavia and Vinyl Scratch decide to combine their respective musical styles into a new genre that will celebrate not only their talent, but also their unique bond, they feel confident that they're the pioneers of the new age. So when the two find their music challenged by another pair of musicians, they set out to make sure that theirs is the best. However, the rival two aren't bad artists themselves, not to mention they’re certainly not… of the same persuasion as Vinyl and Tavi. In the snow-wrapped streets of Manehattan, can they risk exposing their new found -and still taboo- relationship, or will they be doomed to second place?

Incredible cover art by JackiePhantom13! DA: http://jackiephantom13.deviantart.com/

EQD!!
Link: http://www.equestriadaily.com/2012/04/story-mixing-relationships.html

Princess Celestia is a living legend, but much of her life is shrouded in mystery. Records have long since been lost to the decay of time, and the tale of her triumph over Discord has become a fable. The Princess's memory of the event has long since faded... or has it?

Her faithful student lending an eager ear, Celestia recounts the true story of a war-torn Equestria, the struggle against Discord, and the early years of her own life.

Before she was the Princess of the Sun, she was merely a stranger.

(Featured on Equestria Daily!)

A refined mare fresh out of high school and a dropout following her dreams find themselves forced to spend a lot of time together.

With the help of a meddling psychology tutor and their new classmates, can they find what they've been looking for?

French Translation!

Fan Stuff!

There's nothing worse for a pegasus than falling.

[CHALLENGEFIC]: Under 3000 words, not about Twilight or the Princesses, and NO TALKIN'!

Featured on Equestria Daily, 7 May 2012.

It's no mere coincidence that the possessors of the Elements of Harmony all wound up in Ponyville. With careful planning, convincing, and a bit of luck Princess Celestia led six mares along the right path that would forever make them the best of friends.

But first she had to find them.

[In the process of being rewritten]

The P.E.R. - Ponification for the Earth's Rebirth is a rogue organization that forcibly converts humans into ponies. They are reviled by those who oppose the Conversion Bureaus and denounced by Celestia Herself - but they see themselves as knights of Equestria, following a higher cause. Michelson is a Knight of the P.E.R. Morely is a Squire. Together, they'll ponify the world.

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.

Sky Limit is an earth pony. An earth pony born to two pegasus parents. He's always had his head in the clouds with his ideas, but when he gets it into his head to try to prove that the skies aren't just for pegasi anymore, he'll embark on a journey that will take him all over Equestria. But can a pony without wings truly fly?

My Little Pony and all canon characters (c) Hasbro
All other characters (c) to their respective owners

Nightmare Moon visits Twilight in the night, and things get biblical.

Featured on Equestria Daily, 1 May 2012.