I can't believe this! How dare they forget who they're dealing with! I'm the very Element of Generosity! But to ask me to share my suite with the likes of... her? It's inconceivable, preposterous, ludicrous! They seriously think I, Rarity, fashion designer extraordinaire would be willing to share even a suite with such an... uncouth beast! Unfortunately, the Canterlot Ritz—and every other hotel—is booked solid, so it is either this or nothing. I suppose as long as I keep to myself, I will survive the week. Right?

After being exposed to radiation and misfiring age spells, Trixie was forced to relive her foalhood in the care of a mysterious, possibly insane, stallion who claims to be from another planet. Now that he's gone, Trixie will have to make her own way using the skills he taught her and a few pieces of otherworldly technology.

This story is rated M for machine gun.

WANTED:

The newly crowned Princess Twilight Sparkle has set up a bold new initiative to discover new magic, and is sending out an open call to the unicorns of Equestria to apply for her research team. No experience in magical theory or research necessary. Enthusiasm and out-of-the-box thinking a must. The Equestrian government is not responsible for any physical, emotional, or magical trauma experienced during the course of the project or the application process.

Cover art by Page Turner

This story is a sequel to My Little Changeling: Friendship is Weird

After the most important changeling artifact, the Evershifting Stone, is stolen by ponies, one changeling is blamed and exiled. How can he earn back his place in the hive? Find the thief and bring back the Stone.

He tracks the thieves all the way to Canterlot, which has changed a surprising amount in the past year and a half. Can he really find a thief among the confusing mess that is pony life and changeling integration?

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Cover image graciously provided by Raster!
Found on Equestria Daily here!

When dark creatures begin appearing in Equestria, Princess Celestia and Princess Luna summon the bearers of the Elements of Harmony to Canterlot. Before the six ponies can arrive, though, four strange ponies are expelled from a portal that appears in the throne room, and they explain that Equestria is not the only place at risk from these creatures. Thus begins an adventure that will reveal a greater destiny for Ponyville's librarian than she could have ever dreamed of.

Kingdom Hearts/My Little Pony: Friendship is Magic crossover. Pairings undisclosed.

"They've got your little brother."

Those are the words that begin Snowflake's testosterone-filled rampage through Equestria to the gates of Tartarus... and beyond. Only with his cousins, Cloudchaser and Flitter, do they have any chance of rescuing Featherweight from the forces of Evil.

This story is a sequel to Bringing Up Blueblood

Sequel to My Little Alicorn and Bringing Up Blueblood.

It has been almost a year since Luna first uncovered the Arcanus E Draconus and used its dark powers to turn her sister into a filly. Since then, she has become more popular than ever, to the point where the Filly Scouts have invited her to officiate their Jamboree, which is being held in Ponyville this year. At the same time, Celestia wishes to reach closure with the infernal tome, as well as escape from her own growing concerns over her future in Equestria.

Little does Luna know that another force is in Ponyville, looking for revenge. And it might just settle for vengeance by proximity...

Cloud Kicker might just have the wildest life of any pony in Equestria. Marvel at the insanity that is her life, and laugh at the suffering of her poor beleaguered best friend, Blossomforth. And maybe, just maybe, there's more to her than just the lovable sex maniac everypony thinks she is.

This is a semi-sequel to "The Incredibly Dense Mind of Rainbow Dash." Not really a proper sequel, since it's focused on Cloud Kicker and Blossomforth instead of Rainbow and Pinkie, but it's in the same continuity. So I guess that makes it a follow-up-side-quel story. Or something. You don't need to have read "The Incredibly Dense Mind of Rainbow Dash" to read or enjoy this, but you ought to read it anyway, just because.

TvTropes Page

The central story of the Winningverse.

We got a tag for Cloud Kicker, but Blossomforth still deserves one too.

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

Discord is a new draconequus now, and sworn to use his powers only for good, but that doesn't mean he can't still have some chaotic fun while on the job. Tasked with helping to reform a pair of thieves hiding out in an abandoned apartment building, the Spirit of Chaos decides to make a game of it. Two lost souls find their lives on the line as they gamble their freedom in a battle of wits against a grand master, in his own House of Chaos.

Part of the Borderworld.