Pinkie Pie has a strange tale to tell Twilight upon discovering a very strange coin among Pinkie's possessions.

Filly Pinkie Pie wonders why Princess Celestia is sad all the time, even on her birthday. Granny Pie tells her it's because long ago the princess had to destroy her sister Luna in order to save the world and no amount of time has lessened her sorrow. Little Pinkie Pie decides she is going to make Celestia happy with the best birthday present ever! Now all she has to do is build a time machine and go back and change the past...

Posted on EQD way back in 8/7/11 EQD For your Birthday, Princess.

The daily give-and-take among the denizens of Ponyville and its environs. An open-ended anthology of short subjects and vignettes, each too small to post independently. "Offered for sale in fifty fairs..."

Art contributed by the gracious and generous Magello!

During her entrance exam, Twilight's powers goes far out of control, leaving Celestia a shell of herself and Equestria in ruins. Now Nightmare Moon is free, but even she can't stop the Tyrant Filly. She flees through time and space, finding herself in an Equestria familiar to us but odd to her. Can the Mane Six help her stop a Twilight out of control?

Fanfiction.net link here!
Weekly featured fic in Authors Helping Authors group

TV Tropes Page, with sincere thanks to DrTempo.

Cover art from here.

Wake up. Go to work. Save Ponyville from unimaginable horrors beyond time and space. Have lunch with your PFF.

Ditzy Doo lives in a different world than her fellow ponies. She sees things nopony else can see—like higher-dimensional spatial anomalies, fae creatures, and eldritch abominations. And she uses what she sees to solve problems that nopony else even knows about.

But this time, Ditzy may have bitten off more than she can chew. Something very unfriendly is trying to enter Equestria through Ponyville’s Town Hall. An earth pony with an hourglass cutie mark has taken an unhelpful interest in Ditzy. The Princess’s personal student has grown suspicious. And, most irritating of all, her alarm clock radio is acting strangely.

Ditzy must race against the clock to save Ponyville—a clock that keeps playing the same song over, and over, and over ...

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Traducción al español por SPANIARD KIWI aquí.
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Many thanks to everyone who preread and edited my WORDS WORDS WORDS:

Japanese Teeth
Sessalisk
Sereg
Kuroi Tsubasa Tenshi
CDRW
Clever Pun
Connelly
Justanotherbrony

Cover art assembled by yours truly, using a Derpy vector by Sierraex.

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Shoop boopy boop boop doop bedoop.

Upon Nightmare Moon's return, the leaders of other nations gather to discuss the situation.

They're not especially happy about it.

Cover art from the gallery of WingFlyte.

Spanish translation, by SPANIARD-KIWI. Russian translation, by Dark Room Collaboration.

Applejack, while surveying the border between Sweet Apple Acres and the Everfree forest, stumbles across a perfectly ordinary, garden-variety talking snake. In an apple tree. The mane six, of course, decide to be neighborly.

What's the worst that could happen?

A story with religious themes, funny and thoughtful in equal turns, and without any super-depressing grim-dark or blatant preaching. It was conceived, written and edited in just three days, and won first place in the "Deal with the Devil" Writeoff competition. You can find the original (unedited) version, along with plenty of other great entries, right here. It's been awhile, but be sure to check them out if you haven't already!

Star Swirl the Bearded is lost. Very, very lost. He was certain the world was round -- or at least a hemisphere -- and not, as it now appears to be, flat and riding on the backs of four elephants, themselves riding on the back of a massive turtle, swimming through the vast expanses of space.

He's going to need a lot of magical help to get home, and the Disc is going to need help to deal with the strange creatures that followed him through from his home world - creatures whose icy nature threatens to bring about the Apocralypse.

Fortunately, the first person he meets is a wizard. He even has "Wizzard" written on his hat...

Now has a sequel!

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

After a magical accident, Celestia and Luna must try to restore harmony. Celestia's duplicate, however, is having none of it.

Check out the companion pieces, Amphelion, by monokeras and The Banach-Tarski Dragon by CCC, tackling the same premise in a different way.

Cover art from the gallery of mysticalpha.

In which Dinky Doo asks her mother to tell her a story.

An illustrated tale based on the Winnie-the-Pooh stories written by A. A. Milne and decorated by E. H. Shepard, along with the Disney animation 'Winnie the Pooh and the Blustery Day.'