This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

What would you do, if you met a pony who was at once your brother, and yet not? Applebuck wishes to reunite with his 'Cousin JayJay', and braves the dimensional divide to reach his goal. But being a small foal, how will he deal with a world in which everything is flipped? His friends, his family, and even... himself?

My attempt at a more serious 'Luna meets Neil Armstrong' storyline. What would really happen, both on the moon and on Earth? Inspired by 'The Eagle has Landed' by CyanBlackStone.

Princess Luna has found herself on a very different moon after some strange force interfered with her banishment. She doesn't know what the metal objects that keep orbiting and sometimes landing there are, but she wants to find out. Meanwhile, Neil Armstrong believes that being the first man on the moon will be the crowning achievement of his life. Hoo boy, is he ever in for a surprise.

For those who are interested, the most excellent Zanec has provided this link to an interactive Apollo 11 site.

When Apollo 11 lands on the moon, Neil Armstrong utters his famous lines as his boots land in the lunar regolith, but when he turns around he finds something no one was expecting or had ever planned for.
There's an alien on the moon. And it's blue, four-legged, and staring at him.

Sequel here.

If she had been a good little filly, she would have listened to her mommy and daddy and her teacher and the esteemed mayor of Ponyville. If She had been a good little filly she would have stayed indoors, hiding under her bed as she waited for the Royal Guard and the Princesses to arrive and deal with the dragon. If she had been a good little filly, the kind of child that always got what she wanted for Hearth's Warming, she would not be on the trail leading up the mountain, to where the dragon now rested.

Glitter Belle is not a good little filly. She is a curious one, whose curiosity has brought her face to face with a very, very large dragon. Let's hope it's in the mood to talk.

This is 100% Approved by Twilight's Library

Filthy Rich is good at a lot of things...
Investments.
Trades.
Stocks.

He always considered himself to be a good parent as well.
But when Miss Cheerilee requests a meeting with him, he may have to face the fact that his darling daughter isn't as perfect as she seems.

Featured 3/16/14 - 3/19/14

Spike is a dragon with mare troubles, and one of those mares just happens to be his mother. When he meets Lyra, who has troubles of her own, he hatches a plot that they think will be mutually beneficial.

Special thanks to Setokaiva for his proofing work.
Spanish translation by SPANIARD KIWI can be found here

Princess Celestia’s School for Gifted Unicorns is famous across Equestria as a center of academic excellence. Only the best and brightest unicorns are offered places, selected by their academic merit, magical ability and passion for study. To make the admissions process as fair and reliable as possible, all candidates are given three exams by different teams of examiners, who then meet in private to decide which students are most deserving of a place.

Winner of the December 2014 Writeoff competition: Behind Closed Doors.

This story is a sequel to A Stitch in Time

Having discovered the message left for her by Star Swirl the Bearded in the distant past, Twilight once again finds herself caught up in the middle of a struggle against forces far greater than herself. In order to even stand a chance she'll need to travel further and wider than she ever has, and forge some unlikely alliances with old enemies. All to bring down the powers that have manipulated and shaped her entire life, and retake control of her own future.

The conclusion of the Time Loop Trilogy, which began with Hard Reset
Available in Spanish thanks to dgs1993
Series TV Tropes page

Suri Polomare had every reason to be confident. A little theft here, a little deception there, and Fashion Week was as good as hers.

Too bad she didn't think about the long-pressured conscience of a certain timid assistant.

Inspired by the artwork of muffinshire.

Edit: So I've been told this story was featured. That's fantastic and I love you all for it. For srs.